1996/12/23 Caterpillar

Cab Heater Efficiency Improved{7304}

Usage:

515 (4LR),
525 (1DN) Wheel Skidders

Description of Change: Cab heater efficiency may be improved by adding a valve in the transmission cooler to radiator shunt line.

Adaptable To: The shunt line valve is adaptable to first production for the 515 (4LR) and 525 (1DN) Wheel Skidders.

Shunt line (1) allows limited flow from the top of the transmission cooler to the radiator. This flow is utilized to purge air when the cooling system is filled. In extremely cold weather, this limited flow through the radiator could prevent the engine from achieving normal operating temperature. Adding a valve to close the shunt line will eliminate this flow and allow the engine to achieve normal operating temperatures and improve heater efficiency. When the radiator is filled, the valve may be manually opened to purge air from the system. Close the valve in extreme cold weather conditions.

Illustration 1. (1) Shunt line from radiator to transmission cooler.

Caterpillar Information System:

1996/12/23 Grapple Rotator Motor Joint Strengthened{5082,6307}

1996/12/23 Rear Axle Oil Level Raised To Improve Axle Lubrication{3013}

1996/12/23 Service Procedures For Special Application Rollers And Idlers Summarized For Track-Type Troctors{4159,4180}

1996/12/23 Longer Bosses Increase Blade Assembly Service Life{5057,6060,6051,6071,7167}

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

1996/12/16 Cab Air Conditioner Group Improvements Eliminate Debris {7320}

1996/12/16 Longer Tie Rods For Control Valve Groups {5051,5124}

1996/12/16 Cab Improvements Reduce Vibration {7266}

1996/12/16 Spring Force Adjustment Allows Hydraulic Levers To Remain In Detent Position {5051}

1996/12/16 Sprocket Segments Can Be Reworked To Allow Proper Torque {4155}

1996/12/16 Speed And Direction Lever Improvements Prevent Seizing {1901}

1996/12/16 Improved Design Of Decking Blade And Trunnion Caps Provide Increased Service Life {6060,6069}

1996/12/23 Externally Adjusted Relief Valve Used In Steering Control Valve Group{4307,4322}

1996/12/23 Larger Washer Used With Tube Clamps On Hydrostatic Transmission Prevents Clamp From Loosening{3218}

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

1996/12/23 Ride Control Accumulator Recharging Procedure Changed{5081,5077}

1996/12/23 New Sight Gauge Replaces Former Dip Stick For Improved Visibility Of The Front Implement Hydraulic Tank Oil Level{7479}

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

1996/12/30 Wiring Harness Routing Changed To Increase Wire Harness Service Life {1408}

1996/12/30 Improved Clapper Spring Available For Pilot Valve Groups {5059,5125,5126}

1996/12/30 Supplement To Service Manual Module; "Differential Lock-Relief Valve Pressure Check" {3264}

1996/12/30 Service Brake Adjustment Procedure Improves Application Pressure And Performance {4251,4269}

1996/12/30 Systems Operation Testing & Adjusting, 966F & 966F Series II Wheel Loader Air System And Brakes, Service Manual Module Available {0374,4250}

1996/12/30 New Hose Assemblies Are Compatible With The Extended Life Coolant (ELC) And Provide Increased Service Life {1380,1395}