Skyjack SJ519 TH, Service Manual

Page: 100 / 108

100
SJ519 TH 216942AC
Section 4 – Procedures Non-Routine Maintenance
5.6-3 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.
System Pressure
▪
System Pressure Check:
1. Release residual pressure by moving the joystick
several times in each direction.
2. Install a 5,000 psi gauge at port GP3 of Main
Manifold.
GP3 Test
Port
Ma
chin
e
Fro
nt
3. With engine running at low idle, dead-head the
boom retract function. Indicated system pressure
should be 3900 psi.
4. If reading is different than what is mentioned
above, adjustment is required.
▪
System Pressure Adjustment:
1. Loosen the lock nut on the pressure reducing
valve at port RV1 on the Main Control Valve.
RV1
M
ac
hi
ne
Fr
on
t
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 desired reading
is achieved.
3. Tighten the lock nut on the valve RV1 and re-
check the reading to ensure that the correct
pressure is maintained.