PUMP GP-FUEL INJECTION 2128524 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Machine Preparation for Troubleshooting
Move the machine to a smooth horizontal location. Move away from working machines and personnel. Lower the work tools to the ground.
Allow only one operator on the machine. Keep all personnel away from the machine or in the view of the operator.
Engage the parking brake.
Illustration 1 g00893065
Place the steering frame lock in the LOCKED position.Reference: For more information about preparing the machine for troubleshooting, refer to the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.Drift and Isolation Test
This test will help to determine whether the lift cylinders are causing a drift problem. When the oil port at the head end of the lift cylinder is blocked, the lift cylinder should not move during a drift test. If the lift cylinder moves, there is internal leakage in the lift cylinder. This test will determine whether the right cylinder or the left cylinder is causing the drift.Perform this test with an empty work tool.
Table 1
Required Tooling    
Tool     Part Number     Description     Qty    
A     5P-1750     Plate     1    
Start the engine. Warm the hydraulic oil to normal operating temperature of approximately 49 to 65°C (120 to 150°F).
Move the lift cylinder in and out for five repetitions in order to make sure that there is warm oil in the lift cylinder.
Raise the work tool off the ground approximately 1 m (3.3 ft). Place a support block under the work tool. Lower the work tool onto the support block.
Turn the engine start switch to the OFF position.
Make sure that the hydraulic oil pressure is relieved from the hydraulic system by completing the procedure that is specified in Testing and Adjusting, "System Pressure - Release" for the machine that is being serviced.
Illustration 2 g00894418
Main Control Valve in the Front FrameThe hoses for the tilt function are removed for clarity.
Loosen the four bolts that are holding the tube assembly indicated by the arrow in Illustration 2. Install tooling A between the tube assembly and the manifold. Tighten the four bolts.Note: These steps are for isolating the right lift cylinder from the main control valve.
Start the engine and run the engine at low idle.
Tilt back the work tool. Remove the support block that was placed under the work tool.
Turn the engine start switch to the OFF position.
Turn the engine start key to the ON position. Place the lift control lever in the FLOAT position. Measure the distance of cylinder rod movement. Refer to Table 2 for the maximum drift.
Table 2
Maximum Drift For The