988H Wheel Loader Electrohydraulic System Main Control Valve Caterpillar


Main Control Valve
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1.1. 222-4436 Main Control Valve (2-Function)
2.1. 291-8508 Main Control Valve (3-Function)

222-4436 Main Control Valve (2-Function)




Illustration 1g01971119

Main control valve (Bottom view)

(1) Pilot control actuator

ReferenceFor additional information on the specifications of the pilot control actuator, refer to the Service Manual module Specifications, "Pilot Control Actuator" for the machine that is being serviced.

(2) Torque for the nut ... 50 ± 7 N·m (37 ± 5 lb ft)

(3) Installation torque for the main relief valve ... 100 ± 7 N·m (75 ± 5 lb ft)




Illustration 2g01965833

Section A-A

Load check valve

(4) Installation torque for the plug ... 440 ± 34 N·m (325 ± 25 lb ft)

(5) 9L-9188 Spring

Length under test force ... 43.2 mm (1.70 inch)
Test force ... 16 ± 1 N (3.5 ± 0.2 lb)
Free length after test ... 57.9 mm (2.28 inch)
Outside diameter ... 11.18 mm (0.440 inch)

(6) Installation torque for the line relief valve at the head end of the tilt cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)

(7) Installation torque for the line relief valve at the head end of the lift cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)

(8) Installation torque for the check valve ... 50 ± 10 N·m (37 ± 7 lb ft)

(9) Installation torque for the line relief valve at the rod end of the lift cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)

(10) Installation torque for the line relief valve at the rod end of the tilt cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)




Illustration 3g01971276

Section B-B

Float check valve

(11) Installation torque for the float check valve ... 230 ± 20 N·m (170 ± 15 lb ft)

(12) 7J-7852 Spring

Length under test force ... 43.2 mm (1.70 inch)
Test force ... 8 N (1.8 lb)
Free length after test ... 58.7 mm (2.31 inch)
Outside diameter ... 23.01 mm (0.906 inch)



Illustration 4g01971294

Main control valve (Left side view)

(13) Installation torque for the 185-1897 Pressure Reducing Valve ... 13 ± 2 N·m (115 ± 18 lb in)

(14) Installation torque for the 4T-1860 Shuttle Valve ... 58 ± 10 N·m (43 ± 7 lb ft)




Illustration 5g01971337

Pressure reducing valve

(15) Lubricate the O-ring seals and the backup rings with the oil that is being sealed.

Regulated pressure at 5 L/min (1.3 gpm) flow and temperature of 49° ± 3°C (120° ± 5°F) ... 1580 ± 150 kPa (230 ± 22 psi)

Maximum regulated pressure at 0 L/min (0 gpm) flow and temperature of 49° ± 3°C (120° ± 5°F) ... 2415 kPa (350 psi)




Illustration 6g01972375

Section C-C

(16) Torque for two plugs ... 200 ± 20 N·m (150 ± 15 lb ft)




Illustration 7g01972376

Section D-D

(17) Clearance for the stem within the body should be between 0.020 mm (0.0008 inch) and 0.025 mm (0.0010 inch).

(18) Clearance for the stem within the body should be between 0.018 mm (0.0007 inch) and 0.023 mm (0.0009 inch).

291-8508 Main Control Valve (3-Function)




Illustration 8g01979794

Main control valve (Bottom view)

(1) Pilot control actuator

ReferenceFor additional information on the specifications of the pilot control actuator, refer to the Service Manual module Specifications, "Pilot Control Actuator" for the machine that is being serviced.

(2) Torque for the nut ... 50 ± 7 N·m (37 ± 5 lb ft)

(3) Installation torque for the main relief valve ... 100 ± 7 N·m (75 ± 5 lb ft)




Illustration 9g01965833

Section A-A

Load check valve

(4) Installation torque for the plug ... 440 ± 34 N·m (325 ± 25 lb ft)

(5) 9L-9188 Spring

Length under test force ... 43.2 mm (1.70 inch)
Test force ... 16 ± 1 N (3.5 ± 0.2 lb)
Free length after test ... 57.9 mm (2.28 inch)
Outside diameter ... 11.18 mm (0.440 inch)

(6) Installation torque for the line relief valve at the head end of the auxiliary cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)

(7) Installation torque for the line relief valve at the head end of the tilt cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)

(8) Installation torque for the line relief valve at the head end of the lift cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)

(9) Installation torque for the line relief valve at the rod end of the lift cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)

(10) Installation torque for the line relief valve at the rod end of the tilt cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)

(11) Installation torque for the line relief valve at the rod end of the auxiliary cylinder ... 325 ± 40 N·m (240 ± 30 lb ft)




Illustration 10g01967017

Section B-B

Float check valve

(12) Installation torque for the float check valve ... 230 ± 20 N·m (170 ± 15 lb ft)

(13) 7J-7852 Spring

Length under test force ... 43.2 mm (1.70 inch)
Test force ... 8 N (1.8 lb)
Free length after test ... 58.7 mm (2.31 inch)
Outside diameter ... 23.01 mm (0.906 inch)



Illustration 11g01979873

Main control valve (Left side view)

(14) Installation torque for the 6E-4286 Pressure Reducing Valve ... 60 ± 7 N·m (45 ± 5 lb ft)

(15) Installation torque for the 4T-1860 Shuttle Valve ... 58 ± 10 N·m (43 ± 7 lb ft)




Illustration 12g01967022

Pressure reducing valve

(16) Torque for the locking nut ... 13 ± 2 N·m (10 ± 1 lb ft)

(17) Lubricate the O-ring seals and the backup rings with the oil that is being sealed.

Regulated pressure at 2.0 ± 0.5 L/min (0.5 ± 0.1 US gpm) flow and temperature of 49° ± 3°C (120° ± 5°F) ... 1650 ± 150 kPa (240 ± 22 psi)

Regulated pressure at 0 L/min (0 gpm) flow and temperature of 49° ± 3°C (120° ± 5°F) ... 1800 ± 300 kPa (260 ± 44 psi)




Illustration 13g01979957

Section C-C

(18) Torque for two plugs ... 200 ± 20 N·m (150 ± 15 lb ft)




Illustration 14g01979963

Section D-D

(19) Clearance for the stem within the body should be between 0.020 mm (0.0008 inch) and 0.025 mm (0.0010 inch).

(20) Clearance for the stem within the body should be between 0.020 mm (0.0008 inch) and 0.025 mm (0.0010 inch).

(21) Clearance for the stem within the body should be between 0.018 mm (0.0007 inch) and 0.023 mm (0.0009 inch).

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