Fly Boom Relief Valve Adjustment; Test Charge Pump Pressure On Drive Pump - Skyjack SJ82 T Service Manual

Manifolds and Hydraulic Pumps

5.8-7 Fly Boom Relief Valve Adjustment

1. Locate the GP2 port
and remove the cap.
R V G P
3 2
S V
3
D S
V 3
1
Main Manifold
2. Connect a pressure gauge (5000 psi) to the GP2
port.
3. Start the engine from the base control console
and let it run for 2-5 minutes.
4. Fully extend the boom and check the reading
on the gauge. The pressure should be 1500 psi.
Follow the next steps for adjusting the pressure,
if needed.
5. Locate the fly boom relief valve RV4
6. Loosen the lock nut on the fly boom relief valve
RV4. Turn the adjusting stem clockwise to
increase the pressure and counterclockwise to
decrease the pressure.
7. Tighten the lock nut on the fly boom relief valve
RV4 once 1500 psi is observed on the gauge.
You must fully extend the boom to activate a
pressure reading on the gauge.
SJ82 T, SJ86 T
on the main manifold
1
2
D S
V 1
D S
V 2
4
C V
5
C V
.
2
5.8-8 Test Charge Pump Pressure on
Drive Pump
1. Locate test port TP3
2. Connect a pressure gauge (600 psi) to the test
port.
2
Drive Pump - TP3
3. Start the engine from the base control console.
WARNING
To protect the gauge, do not activate any controls
during this procedure.
4. Check the reading on the gauge. Standard
pressure should be 313 ±31 psi.
5. Replace the charge pump relief valve RV10
the standard pressure is not achieved.
6. Repeat steps 2, 3, and 4 after the charge pump
relief valve is replaced.
7. If the pressure is still not in range, repair or
replace the pump as necessary.
Section 5 – Procedures
on the drive pump.
1
1
2
229040ABA
249
if