PINION 1183748 - Caterpillar

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.
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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g03404924
(1) Service brake control valve
(2) Parking brake control valve
Illustration 2 g03404971
Location of pressure tap with shielding removed
(3) Front service brake and parking brake pressure tapSpecifications
Introduction
The following procedure describes the system pressure test for the parking brake.Required Tools
Illustration 3 g03405009
Table 1
Required Tools
Tool Item Qty Part No Description
B B1 1 8T-0855 Pressure Gauge
B2 1 6V-3989 Fitting
B3 2 6V-4143 Quick Connect Coupler
B4 1 177-7862 Hose As Test Preparation
Be sure that the machine is in an open area and that the area is clear of personnel.
Place the steering frame lock in the stored position.
Position the machine on a dry, hard, level surface.Test Procedure
Attach a hydraulic hose and a 0 to 35000 kPa (0 to 5000 psi) pressure gauge to pressure port (3).
Start the engine and allow the accumulator oil pressure to increase to the cut-in pressure.Note: When the engine is running, the accumulator oil pressure will continue to increase to approximately 16000 500 kPa (2321 73 psi).
Push in the parking brake control knob and stop the engine.
Depress the brake pedal repeatedly until the parking brake control knob automatically moves out to the ENGAGED position.
Look at the reading on the pressure gauge. The correct hydraulic oil pressure that automatically engages the parking brake should be below 6550 kPa (950 psi) .
If the reading on the pressure gauge is not correct, the operation of the parking brake control valve is not correct.Inspect the parking brake control valve for parts that are worn or damaged. If any parts are worn or damaged, replace the parking brake control valve.
Remove the test equipment.