Pivot Shaft Seal Leaks On D6K, D6N, And Track-Type Loaders{4153} Caterpillar


`
Pivot Shaft Seal Leaks On D6K, D6N, And Track-Type Loaders{4153} [TIBU5722]
UNDERCARRIAGE
PIVOT BAR GP
Pivot Shaft Seal Leaks On D6K, D6N, And Track-Type Loaders{4153}
1.1. Introduction
2.1. Problem
3.1. Solution
Track-Type Loader:
953C (S/N: 2ZN1-UP; BBX1-UP)
953D (S/N: LBP1-UP)
963C (S/N: BBD1-UP; 2DS1-UP)
963D (S/N: LCS1-UP)
973C (S/N: LDX1-UP)
Track-Type Tractor:
D6K (S/N: DHA1-UP; FBH1-UP)
D6N (S/N: DJA1-UP; DJY1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem




Illustration 1g01949861

(1) Bolt

(2) Bolt

(3) End plate

(4) Seal

(5) Ring

(6) Pivot shaft

(7) Track roller frame

The seal that is used between the pivot shaft ring and the inboard side of the track roller frame is leaking on some machines. This problem is resulting in increased maintenance but usually is not resulting in any machine down time.

The following root causes have been identified for this problem:

  • Improper tightening of the track roller frame retaining plate bolts, resulting in the loss of seal compression.

  • Bad track roller frame bearing positioning (too deep).

  • Abrasive material build-up around the seal, resulting in increased wear of the seal.

  • Low temperature seal stiffening, resulting in a loss of seal compression.

  • Pivot shaft ring separation from the pivot shaft, resulting in a loss of seal compression.

Solution

In order to prevent this problem from occurring perform the following steps:

  1. Clean and inspect the seal area at least every 250 hours. This may need to be done more often if the machine is used in applications were the seal is more exposed. The following is an example of some of these applications:

    • Waste handling

    • Brush clearing

    • Steel mill

  1. Inspect the track roller frame oil level as directed in the Operation and Maintenance Manual for your machine. A drop in the oil level can indicate seal (4) is leaking.

  1. During regular maintenance, ensure bolts (2) are tight. Refer to Table 1 for the inspection torque for bolts (2). If, any of the bolts are loose replace the bolt with a new bolt and apply 9S-3263 Thread Lock Compound to the new bolt. Refer to Table 1 for the installation torques for bolts (1) and (2) .

    Note: Replace loose bolts (2) with 282-0946 Bolt on the D6N only.

    Table 1
    Torque For Bolts (1) and (2)    
    Machine     Installation Torque for Bolts (1)     Inspection Torque for Bolts (2)     Installation Torque for Bolts (2)    
    963C, 963D, 973C, and 973D     240 ± 40 N·m (177 ± 30 lb ft)    
    200 N·m (147 lb ft)    

    240 ± 40 N·m (177 ± 30 lb ft)    
    D6K    
    240 ± 40 N·m (177 ± 30 lb ft)    

    230 N·m (170 lb ft)    

    270 ± 40 N·m (199 ± 30 lb ft)    
    D6N    
    270 ± 40 N·m (199 ± 30 lb ft)    

    450 N·m (332 lb ft)    

    570 ± 80 N·m (420 ± 59 lb ft)    
    953C and 953D    
    100 ± 20 N·m (74 ± 15 lb ft)    

    80 N·m (59 lb ft)    

    100 ± 20 N·m (74 ± 15 lb ft)    

  1. If the track roller frame is removed, inspect the location of the track roller frame bearings. Refer to the Disassembly and Assembly of the track roller frames for you machine for the proper placement of the track roller frame bearings. Inspect the seal and replace the seal, as needed.

If a leak is occurring, then perform the following steps:

  1. The track roller frame oil check and refill interval should be performed more frequently in order to ensure that the track roller frame is lubricated until the next scheduled maintenance.

  1. During the next scheduled maintenance, remove the track roller frame and perform the following steps:



      Illustration 2g01950095

    1. Inspect pivot shaft ring (5). If, ring (5) is loose then reattach ring (5) to pivot shaft (6) with three spot welds at 120 degrees. Use the Table 2 for the correct dimension for reattaching ring (5) to pivot shaft (6).

      Table 2
      Pivot Shaft Ring Position    
      Machine     A    
      D6K    
      248.0 ± 1.5 mm (9.76 ± 0.06 inch)    
      D6N    
      292.0 ± 1.5 mm (11.50 ± 0.06 inch)    
      953C and 953D    
      293.5 ± 1.0 mm (11.56 ± 0.04 inch)    
      963C and 963D    
      352.5 ± 0.5 mm (13.88 ± 0.02 inch)    
      973C and 973D    
      381.25 ± 1.0 mm (15.010 ± 0.04 inch)    



      Illustration 3g01950178

    1. Inspect track roller frame bearings (8) and (9). If, the bearings are recessed more than 5 mm (0.197 inch) then pull out the bearings and reinstall the bearings using the procedure in the Disassembly and Assembly of the track roller frames for you machine.

    1. When, reinstalling the track roller frame use new bolts (2) and apply 9S-3263 Thread Lock Compound to the threads of the new bolts. Refer to Table 1 for the installation torques for bolts (1) and (2) .

    1. Retain all seals, rings, and bolts per your warranty agreement.

Information System:

C9.3 Engines for Caterpillar Built Machines Flame Detection Temperature Sensor - Remove and Install
3512B, 3512C, and 3516B Generator Set Engines with Dynamic Gas Blending Air Starting System
C13, C15, and C18 Tier 4 Interim Engines Sensor Supply - Test
C4.4 Industrial Engine Piston Height - Inspect
C3.4B Engines for Caterpillar Built Machines Piston Ring Groove - Inspect
973D Track-Type Loader Power Train Brake and Final Drive Group
973D Track-Type Loader Power Train Tracks
953D, 963D and 973D Track-Type Loaders Brake Does Not Release
C9.3 Engines for Caterpillar Built Machines Nozzle Heater Harness - Remove and Install - Harness Assembly
953D, 963D and 973D Track-Type Loaders Backup Alarm Does Not Function
D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Hydraulic Fan Speed (On Demand) - Test and Adjust
2009/07/20 Improved Routing for the Ride Control Lines is Now Used {5004, 5057}
C9.3 Engines for Caterpillar Built Machines Temperature Sensor (DPF) - Remove and Install
2009/07/06 New AMOCS Seals That Are Between the Radiator Core and the Tank Are Now Available on Certain Track-Type Tractors and Pipelayers {1353}
3500 Engines Exhaust Elbow - Remove and Install
D8T Track-Type Tractor Declaration of Conformity
D10T Track-Type Tractor Declaration of Conformity
D9T Track-Type Tractor Declaration of Conformity
Installation of the Angling Blade Bulldozer on the D7E Track-Type Tractor{6050, 6701}
3500 Engines Exhaust Manifold - Remove and Install
953D, 963D and 973D Track-Type Loaders Hydraulic System Has Unusual Noise
C9.3 Engines for Caterpillar Built Machines Air Cleaner Housing - Remove and Install
D6T Track-Type Tractor Systems Pressure Reducing Valve - Test and Adjust
C13, C15, and C18 Tier 4 Interim Engines ARD Does Not Activate