1998/03/30 Caterpillar

Correction To Proper Assembly Of Elbow And O-Ring Seal For The Piston Pump Group {5055}

Usage:

416C (4ZN1821-Up, 1WR665-Up),
426C (1YR309-Up, 6XN602-Up),
436C (1FR219-Up, 8TN285-Up) Backhoe Loaders

This article replaces the article "Proper Assembly Of Elbow And O-Ring Seal For The Piston Pump Group" on Page 9 of the January 19, 1998, issue of Service Magazine.

The 030-7946 Elbow and 3J-7354 O-Ring Seal within the 112-6564 Piston Pump Group in the above machines MUST be properly assembled. Improper assembly of the 030-7946 Elbow and 3J-7354 O-Ring Seal may cause hydraulic oil leakage.

The assembly process improvement is in production, effective with the above machines.

Installation

View of the 112-6564 Piston Pump Group.

(1) Pressure and Flow Compensator.

(2) 030-7946 Elbow.

(3) O-Ring Nut.

(4) 135-6615 Tube Assembly.

(5) O-Ring Nut.

1. Install 030-7946 Elbow (2) into the port in pressure and flow compensator (1). Tighten the elbow until 3J-7354 O-Ring Seal contacts the seat in pressure and flow compensator (1).

2. Position 030-7946 Elbow (2) to align with 135-6615 Tube Assembly (4).

3. Start O-Ring Nut (3).

4. Tighten O-Ring Nut (5).

5. Tighten O-Ring Nut (3).

Caterpillar Information System:

1998/03/30 Paint Color Changes Summarized {7581,7559}

1998/03/23 Replacements Products Available For 4C-4079 Brake And Component Cleaner{0680}

1998/03/23 Use 143-6092 Pressure Meter To Measure Differential, Static, And Peak Pressures In Hydraulic Systems{3000,4100,4112,4351,5050,5070,5450,5454,0727}

1998/03/23 Replacement Available For 7M-7260 Liquid Gasket{0648,0649,0651}

1998/03/23 Use 142-5055 Insulation Tester Group To Measure And Check Insulation Resistance{4450,0785}

1998/03/23 Use 152-2067 Differential Pressure Gauge To Monitor Aftercooler Pressure Drop In Applications With Crankcase Fumes Recirculation{1063}

1998/03/23 Use 147-5482 Valve Lash Gauge Group To Measure Valve Lash{0766}

1998/03/23 Lower O-Ring Seal Removed From Mechanical Fuel Injector Group{1290}

1998/03/23 Procedure To Check Hydrofill Levels In Tires{4207}

1998/03/23 Supplement To Article Titled, "Improved Bearings Used In Output Transfer Gear Group"{3159}

1998/03/23 Supplement To Disassembly And Assembly Manual; Procedure To Remove Torque Converter And Hydraulic Retarder{3109,3101,3115,3120,3123,3124,3133}

1998/03/23 A New Engine Auxiliary Water Pump Group (SCAC) And Changes To The Aftercooler Water Lines Group Provide Increased Serviceability{1371}

1998/03/30 Use 133-8877 Field Service Tool Group For Routine Maintenance And Adjustment Operations {7500}

1998/03/30 Procedure To Install Rear Axle On Certain Off-Highway Trucks Has Been Changed {3278,4208}

1998/03/30 New Seat Air Suspension Increases Operator Comfort And Service Life {7300,7312,7318,7321,7324}

1998/03/30 Use FT2546 Preload Tool To Adjust Pinion Bearing Preload {3254}

1998/03/30 Use 1U-9003 Brake Piston Puller For Disassembly And Assembly Of Hydraulic Brake Caliper Group {4256}

1998/03/30 New Custom Product Support Literature Is Available For 793C Trucks Equipped With 3Z-6278 Towing Bumper {0374,7156}

1998/03/30 Final Drive Screen Assembly For Large Off-Highway Trucks Has Been Removed {4208,4051,4050}

1998/03/30 Use FT2461 Pressing Bar, FT2462 Pressing Tube, FT2463 Ring, FT2464 Plate, FT2465 Plate, FT2466 Mounting Plate, And FT2467 Rotating Plate To Disassemble And Assemble Variable Speed Fan Clutch {1359}

1998/03/30 Improved Drive Shaft Group Increases Service Life {3250,3000,3253}

1998/03/30 New Seat Suspension Increases Operator Comfort And Service Life {7312,7321,7318,7324}

1998/03/30 Use 125-5723 Socket Wrench Assembly For Removal And Installation Of Stake-Type Differential Pinion Shaft Nut {3254}

1998/03/30 New Seat Air Suspension Increases Operator Comfort And Service Life {7300,7312,7318,7321,7324}