Charge Relief Valve
(2) Charge Relief Valve.
Make sure that the parking brake is applied. Make sure
that the propel control lever is in NEUTRAL position.
Connect a 4000 kPa (580 psi) pressure gauge to
pressure test port (1) next to the propel charge filter.
Start the engine. Run the engine at high idle. Check
the pressure gauge. The setting for the charge relief
valve should be 2900 ± 140 kPa (420 ± 20 psi).
Charge Relief Valve
The charge relief valve must be adjusted if the pressure
setting is incorrect In order to adjust the charge
pressure, stop the engine and remove the charge relief
valve from the drum propel pump.
If the charge pressure is too low, add shims (3) to the
charge relief valve. If the charge pressure is too high,
remove shims (3) from the charge relief valve.
When the shims are added to the charge relief
valve, a 1 mm (0.04 inch) shim is the equivalent of
reducing the charge pressure by 390 kPa (56.5
psi). When the shims are removed from the
charge relief valve, a 1 mm (0.04 inch) shim is
equal to raising the charge pressure by 390 kPa
Reinstall the charge relief valve.
Perform this test again in order to verify the charge
pressure after the adjustments have been made.
Remove the pressure gauge from the test port.
Parking Brake - Test
SMCS Code: 4267-081
Personal injury or death can result from sudden machine
Sudden movement of the machine can cause injury to
persons on or near the machine.
To prevent injury or death, make sure that the area around
the machine is clear of personnel and obstructions before
operating the machine.
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
Refer to Special Publication, NENG2500, "Caterpillar Tools
and Shop Product Guide" for tools and supplies suitable
to collect and contain fluids on Caterpillar products.
Dispose of all fluids according to local regulations and