Installation Instructions for the 2Q-8245 Fan Control Ar (Auto Reversing) (Kit){1386, 138R} Caterpillar


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Installation Instructions for the 2Q-8245 Fan Control Ar (Auto Reversing) (Kit){1386, 138R} [REHS1600]
HYDRAULIC SYSTEM
CONTROL GP-FAN
Installation Instructions for the 2Q-8245 Fan Control Ar (Auto Reversing) (Kit){1386, 138R}
1.1. Introduction
2.1. Removal of the Guard Group for the Crankcase
3.1. Removal of Engine Compartment Shield Gp
4.1. Removal of Hoses
5.1. Removal of the Shield Assembly for the Alternator
6.1. Replacement of the Hydraulic Fan Piston Motor Gp
7.1. Modification of the Rear Frame
8.1. Replacement of the Fan Drive Pump
9.1. Installation of the Control and Lines Gp-Fan for the Auto Reversing Fan
10.2. Installation of the Wiring Harness for the Chassis
11.2. Installation of the Wiring Harness for the Cab
12.1. Removal of the Grill Assembly
13.1. Installation of the Grill Group
14.1. Installation of the Guard for the Air Conditioner Compressor
15.1. Installation of the Guard Group for the Crankcase
16.1. Installation of Heat Shield Group
17.1. Software Configuration
18.1. Operating Instructions for the Automatic Reversing Fan
19.1. Troubleshooting
20.1. System Operation of the Reversing Fan
21.1. Operator Override
Wheel Loader:
950G Series II (S/N: BAA1-UP; AXR1-UP; AXX1-UP)
962G Series II (S/N: BAD1-UP; AXS1-UP; AXY1-UP)

Introduction

This publication contains the information for the installation of the automatic reversing fan kit.

A complete listing of the parts that are contained in this kit are listed in the Parts Manual, SEBC1370.

This supplemental product support literature should be used with the appropriate Service Manual and the appropriate Parts Manual that is available for this standard machine.

Removal instructions in this procedure should be supplemented with the Disassembly and Assembly.

Do not perform any procedure and do not order parts that are outlined in this publication until you understand the information that is contained in this document.

Removal of the Guard Group for the Crankcase




    Illustration 1g00998282

    Bottom view of the guard group for the crankcase

    (A) Plate

    (B) Plate

    (C) Plate

  1. Remove plates (A), (B) and (C). Keep plate (B) for later use. Discard hardware and plates (A) and (C) .

Removal of Engine Compartment Shield Gp

Note: Removal instructions in this procedure should be supplemented with the Disassembly and Assembly, RENR4307, "Engine Compartment Shield - Remove and Install".




    Illustration 2g00998323

    Partial top view of the rear frame

    (A) Engine Compartment Shield Gp

  1. Remove the Engine Compartment Shield Gp (A) .

Removal of Hoses




    Illustration 3g01319855

    Right side view of the rear frame

    (A) Hose assembly

  1. Remove hose assembly (A) .



    Illustration 4g01319907

    Section X-X from Illustration 3

    (B) Hose assembly

  1. Remove hose assembly (B) .



    Illustration 5g01319912

    Section Y-Y from Illustration 3

    (C) Tube assembly

    (E) Tube assembly

    (F) Tube assembly

    (G) Hardware

    (H) Hardware

  1. Remove tubes (C), (E) and (F) .

  1. Remove hardware (G) and (H). Keep the clip from tube (E) for use later.

Removal of the Shield Assembly for the Alternator




    Illustration 6g01319925

    Front view of engine

    (J) Shield assembly

    (K) Hardware

  1. Remove hardware (K) and shield assembly (J) .

Replacement of the Hydraulic Fan Piston Motor Gp

Note:

Note: The radiator must be removed. Refer to removal instructions in the Disassembly and Assembly, RENR4307, "Radiator and Fan Group - Remove".




    Illustration 7g01319928

    Radiator and fan group

    (A) Piston Motor Gp

    Note: Refer to Disassembly and Assembly, RENR4307, "Fan Group (Includes Fan, Fan Guard, Fan Shroud, and Hydraulic Fan Motor) - Remove".

  1. Remove the Piston Motor Gp (A) .

    Note: Refer to Disassembly and Assembly, RENR4307, "Fan Group (Includes Fan, Fan Guard, Fan Shroud, and Hydraulic Fan Motor) - Install".

  1. Replace the Piston Motor Gp (A) with the 228-8527 Piston Motor Gp .

Modification of the Rear Frame

------ WARNING! ------

Personal injury or death can result from fumes, gases and ultraviolet rays from the weld arc.

Welding can cause fumes, burn skin and produce ultraviolet rays.

Keep your head out of the fumes. Use ventilation, exhaust at the arc, or both, to keep fumes and gases from your breathing area. Wear eye, ear and body protection before working.

Protect yourself and others; read and understand this warning. Fumes and gases can be dangerous to your health. Ultraviolet rays from the weld arc can injure eyes and burn skin. Electric shock can cause death.

Read and understand the manufacturer's instructions and your employer's safety practices. Do not touch live electrical parts.

----------------------



    Illustration 8g01319932

    Top view of the rear frame

    (C) 14 ± 3 mm (0.55 ± 0.12 inch)

    (D) 320 ± 3 mm (12.60 ± 0.12 inch)

    (E) 225 ± 3 mm (8.86 ± 0.12 inch)

    (F) 181 ± 3 mm (7.13 ± 0.12 inch)

  1. Locate the following hardware and weld in place:

    • 189-8354 Bar (1)

    • 8T-4219 Weld Stud (2)

Replacement of the Fan Drive Pump




    Illustration 9g01319937

    Right side view of engine

  1. Remove the existing Piston Pump and replace the Piston Pump with the 229-0293 Piston Pump (1) .

Installation of the Control and Lines Gp-Fan for the Auto Reversing Fan




    Illustration 10g01319941

    View of the control and lines group-fan

  1. Use the following hardware and install the 189-8353 Bracket As (7) onto the block that was added onto the rear frame:

    • Four 8T-4121 Hard Washers (34)

    • Four 8T-4137 Bolts (37)

  1. Use the following hardware and install the 162-2191 Fan Reversing Valve And Mount (4) onto the 189-8353 Bracket As (7) :

    • Two 8T-4121 Hard Washers (34)

    • Two 8T-4137 Bolts (37)

  1. Use a 3D-2824 O-Ring Seal (22) and install a 6V-8637 Seal Connector (29) into the lower right hand port on the 162-2191 Fan Reversing Valve And Mount (4) .

  1. Use a 6V-9746 O-Ring Seal (31) and connect one end of the 189-8368 Hose As (12) onto the 6V-8637 Seal Connector (29) .

  1. Use the existing 6V-9746 O-Ring Seal and connect the other end of the 189-8368 Hose As (12) onto the 229-0293 Piston Pump . Refer to the 229-0293 Piston Pump (1) in Illustration 9.

  1. Use the following hardware and mount the 189-8377 Bracket As (15) onto the rear frame:

    • One 133-3260 Spacer (1)

    • One 8T-4121 Hard Washer (34)

    • One 8T-4195 Bolt (39)

  1. Use the following hardware and secure the 189-8368 Hose As (12) onto the 189-8377 Bracket As (15) :

    • One 6V-1889 Clip (26)

    • One 8T-4121 Hard Washer (34)

    • One 8T-4136 Bolt (36)

  1. Use a 3D-2824 O-Ring Seal (22) and install a 6V-8637 Seal Connector (29) into the upper right hand port on the 162-2191 Fan Reversing Valve And Mount (4) .

  1. Use a 6V-9746 O-Ring Seal (31) and connect the straight end of the 189-8369 Hose As (13) onto the 6V-8637 Seal Connector (29) .

  1. Refer to Illustration 5. Use the existing 6V-9746 O-Ring Seal and connect the other end of the 189-8369 Hose As (13) onto the tee in place of hose assembly (B). Use the existing hardware and secure the hoses.

  1. Use two 3D-2824 O-Ring Seals (22) and install two 189-9883 Elbows (5) into the top of the 162-2191 Fan Reversing Valve And Mount (4) .

  1. Use two 3D-2824 O-Ring Seals (22) and install two 8T-0078 Connectors (33) into the two 189-9883 Elbows (5) .

  1. Use a 6V-9746 O-Ring Seal (31) and connect the ninety degree end of the 2T-2099 Hose As (9) onto the rear 8T-0078 Connector (33) .

  1. Use a 6V-9746 O-Ring Seal (31) and connect the ninety degree end of the 2T-2099 Hose As (10) onto the front 8T-0078 Connector (33) .

  1. Route the 2T-2099 Hose As (9) and the 2T-2099 Hose As (10) to the 228-8527 Piston Motor Gp (19) .

  1. Use two 3D-2824 O-Ring Seals (22) and install two 6V-8637 Seal Connectors (29) into the lower ports on the 228-8527 Piston Motor Gp (19) .

  1. Use a 6V-9746 O-Ring Seal (31) and connect the other end of the 2T-2099 Hose As (9) onto the left hand 6V-8637 Seal Connector (29) .

  1. Use a 6V-9746 O-Ring Seal (31) and connect the other end of the 2T-2099 Hose As (10) onto the right hand 6V-8637 Seal Connectors (29) .

  1. Use a 2M-9780 O-Ring Seal (21) and install a 6V-8625 Elbow (28) into the top port of the 228-8527 Piston Motor Gp (19) .

  1. Use a 6V-8398 O-Ring Seal (27) and connect the straight end of the 189-8367 Hose As (11) onto the 6V-8625 Elbow (28) .

  1. Refer to Illustration 5. Use a 6V-8398 O-Ring Seal (27) and install a 6V-8731 Face Seal Union (30) onto the hose assembly in place of tube assembly (F) .

  1. Use a 6V-8398 O-Ring Seal (27) and connect the other end of the 189-8367 Hose As (11) onto the 6V-8731 Face Seal Union (30) .



    Illustration 11g01319968

    View of the control and lines group-fan

  1. Use the following hardware and secure the 189-8367 Hose As (11) :

    • One 8T-4121 Hard Washer (34)

    • One 8T-4137 Bolt (37)

  1. Use the following hardware and mount the 189-8356 Plate (8) and the 149-2406 Bracket (3) onto the 135-1741 Plate As (2) :

    • Four 7X-7729 Washer (32)

    • Four 8T-4136 Bolt (36)

  1. Use the following hardware and mount the 135-1741 Plate As (2) onto the rear frame and the fan guard assembly:

    • One 5P-1076 Hard Washer (24)

    • One 7X-7729 Washer (32)

    • One 8T-4133 Nut (35)

    • One 8T-4136 Bolt (36)

  1. Use the following hardware and secure the 2T-2099 Hose As (9) and the 2T-2099 Hose As (10) onto the fan guard assembly:

    • One 189-8375 Bracket As (14)

    • One 9D-1829 Clip (23)

    • Two 7X-7729 Washer (32)

    • One 8T-4136 Bolt (36)

    • One 8T-4195 Bolt (39)

Installation of the Wiring Harness for the Chassis




Illustration 12g01320020

Top and right side views of the wiring harnesses

  1. Refer to Illustration 13. Connect the connector on the 189-8413 Chassis Harness As (Automatic Reversing Fan) (17) onto the power lead on the 162-2191 Fan Reversing Valve And Mount .

    Note: The following Steps 2 through 5 are for connecting the end of the 189-8413 Chassis Harness As (Automatic Reversing Fan) (17) that has three wires:

  1. Connect the pink wire that is marked "H704" to socket number "10" on the connector for the engine ECM .

  1. Connect the purple wire that is marked "H702" to socket number "46" on the connector that is for the engine ECM.

  1. Connect the yellow wire that is marked "H703" to socket number "47" on the connector that is for the engine ECM.

  1. Connect the black wire that is marked "229" to frame ground.

    Note: The following Steps 6 through 7 are for connecting the end of the 189-8413 Chassis Harness As (Automatic Reversing Fan) (17) that has two wires:

  1. Connect the purple wire that is marked "H702" to socket number "19" of the 40-pin connector that is in the cab.

  1. Connect the yellow wire that is marked "H703" to socket number "20" of the 40-pin connector that is in the cab.

  1. Use cable ties to secure the harness.

Installation of the Wiring Harness for the Cab

  1. Refer to Illustration 14. Move the existing wire from pin "17" of the 40-pin connector that is in the cab to pin "1" of connector "C3" that is on the 189-8336 Cab Harness As (Automatic Reversing Fan) (6) .

  1. Connect the pink wire that is marked "H795" of the 189-8336 Cab Harness As (Automatic Reversing Fan) (6) to pin "17" of the 40-pin connector that is in the cab.

  1. Connect the purple wire that is marked "H702" of the 189-8336 Cab Harness As (Automatic Reversing Fan) (6) to pin "19" of the 40-pin connector that is in the cab.

  1. Connect the yellow wire that is marked "H703" of the 189-8336 Cab Harness As (Automatic Reversing Fan) (6) to pin "20" of the 40-pin connector that is in the cab.

  1. Route the 189-8336 Cab Harness As (Automatic Reversing Fan) (6) up the ROPS post to the overhead operator panel.

  1. Install the fan reversing 219-9534 Rocker Switch (20) .

  1. Connect the 189-8336 Cab Harness As (Automatic Reversing Fan) (6) onto the 219-9534 Rocker Switch (20) .

  1. Connect the yellow wire that is marked "614" onto socket "A" of any existing connector for a switch .

  1. Connect the black wire that is marked "200" onto socket "B" of the same connector.

  1. Use cable ties to secure the harness.



Illustration 13g01320023

Wiring diagram for the wiring harness for the chassis

(C) Engine ECM

(D) Reversing valve solenoid

(E) Frame ground




Illustration 14g01320024

Wiring diagram for the wiring harness for the cab

(F) Cab

Removal of the Grill Assembly

Note: Removal instructions in this procedure should be supplemented with the Disassembly and Assembly, RENR4307, "Hood - Remove".




    Illustration 15g01320029

    Front view of the grill assembly

    (A) Grill assembly

    (B) Bolts

    (C) Latch pin

    (D) Plate assembly

    (E) Bolts

  1. Remove grill assembly (A) by removing four bolts (B) and plate assembly (D) .

  1. Remove latch pin (C) by removing bolts (E).

Installation of the Grill Group




    Illustration 16g01320035

    Front view of the grill assembly

  1. Use the following hardware and install the 218-2735 Latch (5) onto the 219-6588 Grill As (6) :

    • One 3B-2062 Pin (1)

    • One 3B-4615 Cotter Pin (2)

    • One 6W-5817 Spring (4)

    • One 6W-2523 Pin (13)

  1. Use two 9X-2040 Screws (18) and install the 220-5638 Pin As (8) .

  1. Use the following hardware and install the two 222-4526 Baffles (10) :

    • Two 7X-7729 Washers (14)

    • Two 8T-4133 Nuts (15)

  1. Install a 685 mm (26.97 inch) piece of 6V-2804 Seal (19) onto the 220-8366 Screen (9) .

  1. Install a 40 mm (1.57 inch) piece of 6V-2804 Seal (19) onto the 220-8366 Screen (9) .

  1. Use the following hardware and install the 220-8366 Screen (9) :

    • Three 131-5879 Washers (12)

    • Three 8T-4136 Bolts (16)

  1. Install a 5P-7482 Seal (20) that is 977 mm (38.46 inch) long onto the front top of the 219-6588 Grill As (6) .

  1. Install a 5P-7482 Seal (20) that is 977 mm (38.46 inch) long onto the front bottom of the 219-6588 Grill As (6) .

  1. Install a 5P-7482 Seal (20) that is 801 mm (31.54 inch) long onto the upper right side of the 219-6588 Grill As (6) .

  1. Install a 5P-7482 Seal (20) that is 801 mm (31.54 inch) long onto the upper left side of the 219-6588 Grill As (6) .

  1. Install a 5P-7482 Seal (20) that is 98 mm (3.86 inch) long onto the lower right side of the 219-6588 Grill As (6) .

  1. Install a 5P-7482 Seal (20) that is 98 mm (3.86 inch) long onto the lower left side of the 219-6588 Grill As (6) .

  1. Use the following hardware and install the 219-6588 Grill As (6) onto the machine:

    • Four 7X-7729 Washers (14)

    • Four 8T-4196 Bolts (17)

  1. Use the following hardware and install the 219-6601 Plate As (7) :

    • One 5P-0372 Lock Pin (3)

    • One 096-3781 Clevis Pin (11)

Installation of the Guard for the Air Conditioner Compressor




    Illustration 17g01320045

    View of the guard for the air conditioner compressor

  1. Use a 7X-2539 Bolt (2) and the existing right hand rear bolt to install the 194-5141 Guard (1) under the two rear mounting bolts that are on the air conditioner compressor.

Installation of the Guard Group for the Crankcase




    Illustration 18g01320049

    Bottom view of the guard group for the crankcase

  1. Use the following hardware and install the 189-8373 Door As (2) onto the rear frame:

    • Four 3E-9411 Hard Washers (6)

    • Four 7X-2553 Bolts (7)

  1. Use the following hardware and install the 226-7153 Bracket (4) onto the rear frame:

    • Two 3E-9411 Hard Washers (6)

    • Two 7X-2553 Bolts (7)

  1. Use the following hardware and install the original plate (3) onto the 189-8371 Door As (1) :

    • Two 8T-4121 Hard Washers (8)

    • Two 8T-4195 Bolts (9)

  1. Use the following hardware and install the 189-8371 Door As (1) and the 226-7154 Bracket (5) onto the rear frame:

    • Two 3E-9411 Hard Washers (6)

    • Two 7X-2553 Bolts (7)

  1. Use the following hardware and secure the 189-8371 Door As (1) in the CLOSED position:

    • Two 9X-8257 Washers (10)

    • Two 7X-2553 Bolts (7)

Installation of Heat Shield Group




    Illustration 19g01320069

    View of heat shield group

  1. Remove the muffler for easier installation of the heat shield group.



    Illustration 20g01000191

    View of front bolt on cover for the front manifold




    Illustration 21g01000199

    View of rear bolt on cover for the front manifold

  1. Use the following hardware and install the front manifold 230-3128 Cover (1) :

    • Two 8T-4908 Bolts (11)

    • Two 8T-4224 Hard Washers (8)




    Illustration 22g01000202

    View of bolt on the cover for the rear manifold

  1. Use the following hardware and install the rear manifold 230-3127 Cover (2) :

    • One 5M-3062 Bolt (9)

    • One 8T-4896 Hard Washer (10)




    Illustration 23g01000211

    Overall view of the heat shield group

  1. Install the 230-3126 Turbocharger Cover (Front) (3) and the 235-5312 Cover (Rear) (4) .

  1. Install the 232-1696 Elbow Cover (5) .

  1. Refer to Illustration 19. Install the 235-5777 Bracket Cover (6) .

  1. Slip the 230-3125 Muffler Cover (7) over the muffler and reinstall the muffler. Secure the 230-3125 Muffler Cover (7) .

Software Configuration

Note: This is a configurable feature that must be activated with the product software programming system or a service tool.

  1. Use a AVSpare Electronic Technician and select the engine electronic control module.

  1. Select "SERVICE" from the menu.

  1. Select "CONFIGURATION" from the menu.

  1. Double click on the "Reversing Fan" feature on the configuration screen.

  1. Enter code 3072 in order to enable the "Reversing Fan" feature and click "OK".

  1. Enter code 3328 in order to disable the "Reversing Fan" feature and click "OK".

Note: The feature will be activated on the next power cycle.

Operating Instructions for the Automatic Reversing Fan

Switch Positions

In the NORMAL position, the automatic reversing fan will operate in the automatic mode.

Note: The factory sets the cycle time for the automatic mode at 30 seconds for each 30 minutes.

In the TOP position, the automatic reversing fan will reverse and the cycle timer will start again. Use this position to manually purge the fan. Do not hold the switch in the TOP position.

Troubleshooting

Note: Refer to the Schematic, RENR4362 for electrical problems.

Note: Refer to the Schematic, RENR4322 for hydraulic problems.




Illustration 24g01320078

View of fan reversing valve

(A) Port C1

(B) Port C2

(C) Relief valve for port C2 (B)

(D) Main relief

(E) Relief valve for port C1 (A)

    Note: An explanation of the electrical operation of the fan reversing valve is included in this publication.

    Note: Perform the following Steps while the engine is shut off.

  1. Use a pump that has a flow rate of 1 to 2 GPM. Connect the pump to port (A) and to port (B) of the fan reversing valve.

  1. Plug the tank port in order to keep the oil from the pump from flowing into the hydraulic tank.

  1. Run the pump. While the oil is flowing into port (A) on the fan reversing valve, read the pump pressure.

  1. Check the relief valve that is located closest to port (B).

  1. All relief valves should be checked in the relief valve port closest to port (B) in order to avoid the check valves and the solenoid.

  1. The relief valves that are located closest to port (A) and to port (B) are the crossover relief valves.

  1. The relief valve that is located closest to the mounting bracket is the pump relief valve.

System Operation of the Reversing Fan

The cooling system is a hydraulically driven fan, that is controlled by an on demand fan control system. The on demand fan control system controls the fan speed in order to provide the required amount of cooling air. This will maintain important system temperatures. During heavy machine operation or high ambient temperatures, the on demand fan control system will increase the fan to the maximum speed. During light usage and lower ambient temperature, the on demand fan control system will maintain a lower fan speed. This can result in lower horsepower requirements. The on demand fan controls the speed of the fan system through the use of a variable displacement piston pump. This will vary the volume of hydraulic oil to the fan motor. The volume of oil that is produced by the hydraulic fan pump is controlled by the pressure and flow compensator valve.




Illustration 25g01320090

Schematic for the reversing fan system

(1) Reversing valve

(2) Solenoid valve (reversing valve)

(3) Check valve

(4) Relief valve

(5) Stem

(6) Makeup valve

(7) Stem

(8) Solenoid valve (hydraulic fan)

(9) Reversing motor

(10) Check valve (hydraulic oil cooler bypass)

(11) Hydraulic oil cooler

(12) Crossover relief valves

(13) Pressure and flow compensator valve

(14) Filter

(15) Hydraulic fan pump

(16) Hydraulic tank

(17) Screen group

(18) Sensor (hydraulic oil)

(19) Sensor (Air intake manifold)

(20) Sensor (transmission oil)

(21) Sensor (engine coolant)

(22) Fan override switch (cab panel)

(23) Engine ECM

(X) Port for standard direction

(Y) Port for reverse direction




Illustration 26g01320084

Lines group for the reversing fan

(1) Reversing valve

(9) Hydraulic fan motor

(A) Hose between the reversing valve and the hydraulic oil cooler

(B) Hose between the hydraulic fan pump and the reversing valve

Hydraulic fan pump (15) is mounted to the front housing of the engine on the right side of the machine. Hydraulic fan pump (15) draws oil from hydraulic oil tank (16) through the inlet of the fan pump. Pump supply oil from hydraulic fan pump (15) flows into the inlet of reversing valve (1) through hose (B). Then, the hydraulic oil flows through reversing valve (1) to hydraulic motor (9). The fan blades rotate. Hydraulic fan motor (9) is located at the rear of the machine between the radiator and the engine. The return oil flows from hydraulic motor (9) through reversing valve (1), and through hose (A). Return oil that is flowing through hose (A) will flow through oil cooler (11), through filter group (14) and into hydraulic tank (16). The rotation of the fan forces cooling air to flow through the cooling package. The reversing fan also forces a reverse flow of cooling air through the cooling package.

When the engine is first started and the hydraulic oil is cold, the return oil from the piston motor can not easily flow through hydraulic oil cooler (11). The oil pressure will increase in the hydraulic oil cooler. The check valve (hydraulic oil cooler bypass) (10) will open. Check valve (10) limits the maximum oil pressure in hydraulic oil cooler (11) to 450 ± 55 kPa (65 ± 8 psi). Case drain oil from hydraulic fan pump (15) and the case drain from piston motor (9) flow through a hydraulic oil line to hydraulic oil tank (16). The oil from the case drain is filtered through a screen in hydraulic tank (16) .

When the temperature of the oil increases, the pressure of the oil decreases. The force of the spring in the check valve (hydraulic oil cooler bypass) (10) is greater than the force of the oil pressure that is acting on the spring. This allows the check valve (10) to close. The hydraulic oil flows through hydraulic oil cooler (12), through hydraulic oil filter (14), and then into hydraulic tank (16) .

The hydraulic fan system controls the speed of the fan. The fan speed is controlled by four temperature sensors (18), ( 19 ), (20) and (21). Sensors (18), ( 19 ), (20) and (21) send data to engine ECM (23). Engine ECM (23) will interpret the data from sensors (18), ( 19 ), (20) and (21). Then, engine ECM (23) sends a change in current to the solenoid valve (demand fan) (8). A reduction in current from engine ECM (23) will increase the flow of pump supply oil from hydraulic fan pump (15) to the hydraulic fan motor (9). An increase in current from engine ECM (23) will decrease the flow of pump supply oil from hydraulic fan pump (15) to the hydraulic fan motor (9) .

Reference For information about the hydraulic fan pump, refer to the Service Manual module Systems Operation, "Piston Pump (Hydraulic Fan)" for the machine that is being serviced.

ReferenceFor information about the hydraulic fan motor, refer to the Service Manual module Systems Operation, "Piston Motor (Hydraulic Fan)" for the machine that is being serviced.

ReferenceFor information about adjusting the speed of the hydraulic fan system, refer to the Service Manual module Testing and Adjusting, "Hydraulic Fan Speed - Test and Adjust" for the machine that is being serviced.

In a machine that is equipped with a reversing fan system, fan motor (9) will rotate in both directions. The direction of the fan motor will be controlled by solenoid valve (2). If solenoid valve (2) is de-energized,the hydraulic fan motor will rotate in the standard direction. The flow of oil into reversing valve (1) will open check valve (3) and flow through stem (5). Then, the pump supply oil flows into port (X) of hydraulic motor (9) and hydraulic motor (8) rotates. As hydraulic motor (9) rotates, the return oil flows out of the hydraulic motor through port (Y), through stem (7), through hydraulic oil cooler (11), through oil filter (14), and into hydraulic tank (16) .

In the reversing valve (1), relief valve (4) regulates the pressure of the pump supply oil. Crossover relief valves (12) are installed in the valve in order to relieve any outside forces on the hydraulic fan system. The pressure in either of the passages that are flowing into the motor can rise suddenly if the fan blades are affected by an external force. In this case, the force on the crossover relief valve will open the respective relief valve and the oil will flow back to the hydraulic tank.

In the reversing valve (1), check valve (6) is installed for a makeup valve. The makeup valve eliminates cavitation of the fan motor (9) during reduced oil flow. When check valve (6) is open, the return oil will flow back through makeup valve (6). This condition happens when the fan slows and/or the fan stops. When the hydraulic fan pump slows down, the supply of oil to fan motor (9) is reduced. Fan motor (8) will continue to rotate because the resistance of the air that is being pushed through the radiator is not strong enough to stop the fan blade from turning fan motor (8). The force of the oil will override the spring in check valve (6). Check valve (6) will open and the return oil re-enters the fan motor through stem (5).

The hydraulic fan system rotates the fan blades in the standard direction for 20 minutes. After engine ECM (23) has timed out, solenoid valve (2) will receive current from engine ECM (23). Solenoid valve (2) will be energized. Then, the fan motor will rotate in the opposite direction for 25 seconds. After engine ECM (23) times out for the 25 seconds, the rotation of the fan motor changes to the standard direction. Illustration 5 shows the movement of solenoid valve (2) and the stems (5) and (7) in reversing valve (1).

After 20 minutes of standard rotation, solenoid valve (2) is energized and the solenoid valve shifts to the right. Pilot oil is directed to the ends of the stem (5) and stem (7). Stem (5) and stem (7) will shift to the right. The path of oil will be changed. The pump supply oil from stem (5) now flows to port (Y) for the reverse direction of hydraulic fan motor (9). Return oil from port (X) of hydraulic motor (9) flows through stem (7) and to the hydraulic tank. Hydraulic fan motor (9) will rotate in the reverse direction for 25 seconds. After 25 seconds, the current from engine ECM (23) is interrupted and solenoid (2) is de-energized. The pilot oil to stem (5) and to stem (7) is blocked. Then, the springs in the stems (5, 7) shift stems (5) and (7) to the left. Pump supply oil flows to port (X) for the standard direction and hydraulic fan motor (9) rotates in the standard direction for 20 minutes.

Operator Override

When the operator determines that the fan motor should be reversed, fan override switch (22) can be momentarily activated. When fan override switch (22) is momentarily activated, a signal is sent to engine ECM (23). Engine ECM (23) sends current to solenoid valve (2) and the solenoid valve is energized. Solenoid valve (2) sends pilot oil to stems (5) and (7). Stems (5) and (7) shift to the right and pump supply oil is sent to port (Y) on the hydraulic fan motor. The rotation of the fan motor will be reversed for 25 seconds. At that time, the current to solenoid valve (2) is interrupted and solenoid (2) is de-energized. Stems (5) and (7) shift to the left. Pilot supply oil will be sent to port (X) for the standard direction. Hydraulic fan motor (9) rotates in the standard direction for 20 minutes or the operator activates fan override switch (22).

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