DRIVE GP-PUMP 2677180 - Caterpillar

Hydraulic oil pressure can remain in the hydraulic system on this machine after the engine and pump have been stopped. Serious injury can result if this pressure is not released before any service is done on the hydraulic systems. In order to prevent possible injury, release the hydraulic system pressure before working on any fitting, hose, or hydraulic component.Lower all attachments to the ground before service is started. If the hydraulic system must be serviced, tested, or adjusted with the attachment in the raised position, the attachments and lift cylinders must be supported properly.Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Dispose of all fluids according to local regulations and mandates.
Introduction
This test will determine the following:
The pressure of the lubrication oil at the lubrication distribution manifold is at the specified limit.
Any restrictions in the oil cooler
The lubrication oil for the transmission is at the specified pressure.The lubrication oil for the transmission includes lubrication oil for the transfer and bevel gears and the steering and brakes. All of this lubrication oil is delivered from the lubrication distribution manifold.Required Tools
Illustration 1 g01089423
Tooling (A)
Table 1
Required Tools
Tooling Item Part
Number Description Qty
A A1 8T-0855 Pressure Gauge
0 to 4000 kPa (0 to 580 psi) 1
A2 6V-3989 Fitting 1
A3 6V-4143 Coupler 2
A4 177-7861 Hose As
0 to 6000 kPa (0 to 870 psi) 1 Test Procedure (Lubrication Distribution Manifold)
Move the machine to a smooth horizontal location.
Lower all of the implements.
Illustration 2 g01415862
(1) Pressure Tap ("L2")
(2) Lubrication Distribution Manifold
Locate pressure tap (1) ("L2") on lubrication distribution manifold (2). Lubrication Distribution Manifold (2) is located on the front of the main case inside the right frame.
Attach Tooling (A) to pressure tap (1) ("L2").
Start the engine. Warm the hydraulic