Skyjack SJ1044 TH, Manual

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171
SJ1044 TH, SJ1044 THS, SJ1056 TH, SJ1056 THS, SJ1256 THS
230790ABA
Non-Routine Maintenance Section 5 – Procedures
5.6-4 Hydraulic Pressure Test Procedure
IMPORTANT
All checks and adjustments are to be made with
the engine running at low idle, the transmission
shifter in Neutral and the parking brake applied.
CAUTION
The addition of a hydraulic accumulator on this
system causes residual pressure to be present
AFTER the engine has been turned OFF. Prior
to opening any hydraulic fitting in this system,
move the joystick several times in each direction
to relieve this residual pressure. Failure to do so
may result in personal injury.
Load Sense Compensator Pressure
▪
Load Sense 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 100 Compensator Pressure
3.
With engine running at low idle, read the pressure
indicated on the gauge. The correct pressure
should be 450 psi.
4. If reading is other than 450 psi, adjustment is
required.
▪
Load Sense Compensator Adjustment:
1.
Loosen the lock nut on the load sense
compensator.
Pressure
Compensator
Pressure
Compensator
Load
Sense
Load
Sense
Figure 101 Load Sense Compensator Adjustment
2. With engine running at low idle, turn the
adjustment screw clockwise (CW) to increase the
pressure reading and counter-clockwise (CCW) to
reduce the pressure reading until a reading of 450
psi is achieved.