172
SJ1044 TH, SJ1044 THS, SJ1056 TH, SJ1056 THS, SJ1256 THS
230790ABA
Section 5 – Procedures Non-Routine Maintenance
System Pressure (Compensator Pressure)
▪
System Pressure (Compensator Pressure)
Check:
1. Release residual pressure by moving the joystick
several times in each direction
2. Install a 5,000 psi gauge into port GP1 of the main
manifold.
Port GP1
Figure 102 Pressure Compensator Pressure
3. With engine running at low idle, dead-head the
boom retract function. Indicated system pressure
should be:
▪
3250 psi for SJ1044/1056 TH/THS
▪
3900 psi for SJ1256 THS.
▪
System Pressure (Compensator Pressure)
Adjustment:
1. Loosen the lock nut on the pressure compensator.
Pressure
Compensator
Pressure
Compensator
Load
Sense
Load
Sense
Figure 103 Pressure Compensator Adjustment
2. With engine running at low idle, dead-head
the boom retract function, turn the adjustment
screw clockwise (CW) to increase the pressure
reading and counter-clockwise (CCW) to reduce
the pressure reading until desired reading is
achieved.
Steering Pressure
▪
Steering Pressure Check:
1. Release residual pressure by moving the joystick
several times in each direction
2. Install a 5,000 psi gauge into port GP3 at the
front of the main control valve as shown in figure
below.
Port GP3
Figure 104 Maximum Steering Pressure
3. With engine running at low idle and steering
dead-headed in either direction, read the pressure
indicated on the gauge. The correct pressure
should be 2,600 psi.
4. If reading is other than 2,600 psi, adjustment is
required.
▪
Steering Pressure Adjustment:
1. Loosen the lock nut on the maximum steering
pressure reducing valve at port RV2 on the Main
Control Valve.
Port RV2
Figure 105 Maximum Steering Pressure Adjustment
2. With engine running at low idle and the steering
dead-headed to one side, turn the adjustment
screw clockwise (CW) to increase the pressure
reading and counter-clockwise (CCW) to reduce
the pressure reading until a reading of 2,600 psi is
achieved.
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