Case 1150D, 1155D Crawler Dozer Repair Manual

Manuals: Service Manual
General
Engines
Fuel System
Electrical System
Track System
Power Train
Brakes
Hydraulic System
Mounted Equipment
Manual Extract Checking Control Rack Movement

In some instances when an engine is hard to start and there is no exhaust smoke, it may be due to the Control Rack sticking in the stop position. The stop position on the Robert Bosch Governor is always with the control rack toward the rear of the injection pump or governor.

The sticking of the control rack can be due to gum and varnish in the fuel. Instruct the customer to use a small quantity of “Case Diesel Fuel Conditioner” in the fuel tank daily. This will clean out the gum and varnish deposits already in the engine and will prevent these deposits from forming. Refer the customer to the Case Diesel Fuel Conditioner in the Fuel Specifications Section of the Operator’s Manual.

To free the control rack, proceed as follows: 1. Loosen and remove the cap nut on the front of the injection pump.
2. Place the throttle in the wide open position so the control rack will be toward the full load position.
3. Work the control rack from the cap nut end by hand a few times to relieve the sticking due to the gum and varnish.
4. Make sure the control rack works easily and smoothly before replacing and tightening the cap nut.