1996/08/19 Caterpillar

Improved Test Procedure For Hydraulic Pump Torque Limiter {5070}

Usage:

416B (8SG, 8ZK),
426B (5YJ, 6KL),
428B (7EJ),
436B (6MJ, 7FL),
438B (3KK) Backhoe Loaders

The machines listed above have a torque limiter control mounted on top of the hydraulic pump. The purpose of the torque limiter control is to limit flow under conditions that may cause the engine to stop. There is typically no adjustment required to this valve. If an adjustment is necessary, the following adjustment procedure can be used. This method of adjustment provides optimum use of the engine power.

Adjustment Procedure:

1. Set engine speed at 950 rpm. Make sure that the hydraulic oil temperature is a minimum of 50°C (122°F)

2. Engage the boom lock. Operate the "BOOM DOWN" control lever. If the torque limiter is properly adjusted, the engine speed will slow to approximately 750 rpm.

3. If the engine speed does not slow to 750 rpm, adjust the set screw on the front of the torque controller in the clockwise direction.

4. Repeat Steps 2 and 3 until the engine speed slows to approximately 750 rpm when the "BOOM DOWN" control lever is operated.

Caterpillar Information System:

1996/08/19 Cab Improvements Reduce Glass Fracture and Improve Sealing {7310,7323,7340}

1996/08/12 New Connector Assembly In Water Lines Group {1380}

1996/08/12 Be Sure To Use New 129-1939 Grease When Rebuilding Water Pump Groups {1361,0645}

1996/08/12 New High Efficiency Secondary Fuel Filter Assembly Improves Injector Life On 3500 Engines With EUI Injectors {1261}

1996/08/12 New Basic Exhaust Bypass Group (Wastegate Valve) Used In Exhaust Bypass Group {1057}

1996/08/12 New Grooved Piston Assemblies Available For Piston Pump Rotating Groups {5070}

1996/08/12 Smaller Diameter O-Ring Seal Used On Head For Threaded Gland Cylinder Groups {4303,5101,5102,5104,5452,7562}

1996/08/12 New Maintenance Schedule Reduces Cost Of Servicing {7500}

1996/08/12 Load Capacity Chart Part Numbers Are Now Available For Telehandlers Under ANSI Regulation {6400,7000}

1996/08/12 Individual Components Of The Rolling Hoses Are Available as Separate Service Parts {5057}

1996/08/12 Longer Battery Cable Improves Service Life of Battery Posts {1402}

1996/08/12 New Priority Valve Spool Increases Steering System Flow {4306,4320}

1996/08/19 Improved Tachometer Assembly Now Used Which Eliminates The Problem Of Moisture Entering The Flat Bezel {7462}

1996/08/19 Replacing The Tee Gasket In Split Oil Pan Groups With A Flexible Gasket Maker {1300}

1996/08/19 New Adapter Used In Oil Filter Group To Provide Increased Parts Commonality {1318}

1996/08/19 New Seal Retainers And Backing Plate Used To Reduce Oil Leaks And Provide An Increased Face Load On Duo-Cone Seals {4251,7561}

1996/08/19 New Orifice Plate To The Rear Brake Cooling Return Oil Line Significantly Reduces Hub Wear {4257}

1996/08/19 New Seal Used In Metering Pump Group To Improve Service Life {4312}

1996/08/19 Improvement For 117-7553 (Fuse Panel) Breaker Group Access {1417}

1996/08/19 New Parts Service Bearing For The 6Y-5893 and 6Y-5965 Basic Torque Converter Groups Gives Longer Service Life {3101,3134}

1996/08/19 New Master Cylinder Group Reduces Brake Pedal Effort {4258}

1996/08/19 Governor Control Cable Improved {1265}

1996/08/19 Procedure For Setting Rear Steering Position Sensor {4005}

1996/08/19 Service Parts Available For Attachment Coupler Cylinder Lock Valve {5133}