ROLLER AR-TRACK & CARRIER 1941164 - Caterpillar

Test and Adjustment of the Pressure Reducing Valve
Table 1
Required Tools    
Part Number     Description     Quantity    
6V-7830     Pressure Gauge     1    
    Stopwatch     1    The pressure reducing valve is located behind an access panel on the right console of the operator station.
Illustration 1 g00774013
(1) Accumulator (2) Pressure reducing valve (group) (3) Pressure reducing valve (4) Relief valveNote: Low pilot pressure produces poor response at the pilot control levers. High pilot pressure produces extreme sensitivity at the pilot control levers.
Illustration 2 g00771517
The pressure tap is located behind an access door on the right fender of the machine. (5) Pilot supply pressure (pressure after pressure reducing valve)
Attach a pressure gauge to pressure tap (5) for pilot pressure on the right fender.
Operate the engine and exercise the implement hydraulics. The pilot pressure should be a maximum of 3275 175 kPa (475 25 psi).
If the pilot pressure is not correct, follow Steps 4 through 11 in order to adjust the pilot pressure.
Remove the operator's seat.
Remove the access panel from the right console of the operator station.
Attach a pressure gauge to pressure tap (5) for pilot pressure on the right fender.
Operate the engine and exercise the implement hydraulics.
Loosen the locknut on the adjustment screw of pressure reducing valve (3). Turn the adjustment screw until the pilot pressure is correct.Note: One turn adjusts the pilot pressure by 1380 kPa (200 psi).
Tighten the locknut on the adjustment screw to a torque of 12 N m (9 lb ft).
Install the access panel on the right console of the operator station.
Install the operator's seat.Test of the Relief Valve
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.
The pressure reducing valve is located behind an access panel on the right side of the operator station.
Illustration 3 g00774013
(1) Accumulator (2) Pressure reducing valve (group) (3) Pressure reducing valve (4) Relief valveThe relief valve can be removed for a bench test, if necessary.
Remove the operator's seat.
Remove the access panel from the right console of the operator station.
Remove relief valve (4). Install the relief valve in the test bench to a torque of 50 5 N m (37 4 lb ft).
Loosen the locknut on the adjustment screw of relief valve (4). Turn the adjustment screw until the relief pressure is correct. The