1996/12/23 Caterpillar

Externally Adjusted Relief Valve Used In Steering Control Valve Group{4307,4322}

Usage:

631E (1AB),
651E (89Z),
834B (92Z, 7BR) Wheel Tractors;
836 (3RL, 7FR) Landfill Compactors;
988B (50W),
988F (8YG, 2ZR),
992D (7MJ) Wheel Loaders

Description of Change: An externally adjusted relief valve replaces a plug and shims in the steering control valve group. The externally adjusted relief valve has two advantages:

* A retainer and locknut allow easier, accurate settings for relief pressure.

* Contaminants are kept out of the steering control valve.

Adaptable To: The externally adjusted relief valve replaces the 9S-4187 Plug (6), and shims (7) used in 6E-4031, 6E-5171, and 8J-2318 Steering Control Valve Groups.

This change is effective with 631E (1AB1655), 651E (89Z277) and 834B (7BR566) Wheel Tractors, 836 (7FR230) Landfill Compactors, 988F (2ZR282) and 992D (7MJ562) Wheel Loaders. Earlier machines are adaptable.

This change is also adaptable to all 836 Landfill Compactors, 834B Wheel Tractors, and 988B Wheel Loaders.

Typical Steering Control Valve Group View A: Externally Adjusted Relief Valve (1) 9X-6395 Nut. (2) 9T-7202 Retainer. (3) 133-1480 Spacer. (4) 3K-0360 Seal. (5) 1L-3583 Dowel. View B: Shim Adjusted Relief Valve (4) 3K-0360 Seal. (6) 9S-4187 Plug. (7) Shims.

Caterpillar Information System:

1996/12/23 Improved Relief Valve Group For Drive System Reduces Pressure Spikes{5069}

1996/12/16 Tools Used For Transmission Overhaul {3400}

1996/12/16 1U-9069 Limp Home Switch Allows Transmission Control Valve To Be Remotely Operated If Controller Fails {3418}

1996/12/16 Use 1U-9079 PTO Alignment Tool To Aid In Aligning PTO Drive Shaft During Installation {3107}

1996/12/16 Tools Used For Removal And Installation Of Rear Axle Group {3278}

1996/12/16 Use 1U-9100 Adapter Cable To Connect Mid-Size Challenger's On-Board Electronic System To A Personal Computer {7490}

1996/12/16 O-Ring Available For 816328 E.H.P. Block {5125,5126,5059,5461,5466,6406,6460}

1996/12/16 Improved Fuel Sender Assembly Available {7481}

1996/12/16 Exhaust Outlet Tubes Used On Exhaust Heated Truck Body Groups To Keep Exhaust Soot And Condensation Off Rear Lamps {7258}

1996/12/16 Correct Ride Height Settings And Adjusting Procedure Must Be Used {7201,7213}

1996/12/16 New Steering Metering Pump Group Gives Smoother Steering Operation {4312}

1996/12/16 Alternative Brake Caliper Seal Kits Can Withstand Extreme Operating Temperatures {4256}

1996/12/23 Orificed Check Valve Removed From Hoist Cylinder Groups For Truck Bed{5102,5486}

1996/12/23 Improved Seals And Bearings Used To Reduce Seal Leaks In Transfer Gear Groups (6WD){3250}

1996/12/23 Torque/Turn Method Used To Tighten Brake Caliper Retaining Bolts{4256}

1996/12/23 New Temperature Sensors Used Which Prevent False Over Temperature Warnings{1906,1400}

1996/12/23 New Telehandler Brake Pack Adjustment Procedure For Rebuilt Brake Groups{4251,4004,4255,4261}

1996/12/23 New Rotocoil Assembly Used In Engine Cylinder Head Groups{1109}

1996/12/30 Description Of August 1996 (AUG96) Personality Module Changes For 3176B (43Z), 3176C (7ZR), And 3196 (6AR) Engines {1902,1901,1923,7414}

1996/12/30 3054 Engine - New Rear Crankshaft Oil Seal Housing Provides Better Seal {1161}

1996/12/30 Seal Improvement Prevents Leakage In Hook Winch Groups {5417}

1996/12/30 Improved Seals And Bearings Used To Reduce Seal Leaks In Output Transfer Gear Groups {3159,3003}

1996/12/30 New Hydraulic Pump Group Increases Service Life {5070}

1996/12/30 Procedure For Aligning Front Suspension Frame Group With Output Transfer Gearbox {7200}