Skyjack SJ61T Service Manual

Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007 Page 217
Section 5 - Procedures Service and Maintenance
5.8-7 Fly Boom Relief Valve Adjustment
1. Locate the GP2 port on the main manifold
and remove the cap.
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. Pressure should be
1500 psi. Follow the next steps for adjusting
pressure if needed.
5. Locate y boom relief valve RV4.
6. Loosen the lock nut on y boom relief valve
RV4. Turn the adjusting stem clockwise to
increase pressure and counterclockwise to
decrease pressure.
7. Tighten the lock nut on fly boom relief
valve RV4 once 1500 psi is observed on
the gauge. You must fully extend boom to
activate pressure reading on gauge.
5.8-8 Test Charge Pump Pressure on
Drive Pump
1. Locate test port TP3 on drive pump.
2. Connect a pressure gauge (600 psi) to
test port.
TP3
Charge
Pressure
Test Port
RV10
Charge Pump
Relief Valve
Drive Pump - TP3
3. Start engine from base control console.
WARNING
Do not activate any controls during
procedure to protect gauge.
4. Check reading on gauge (standard
pressure should be 313 ±10% psi.)
5. Replace charge pump relief valve RV10 if
pressure is not achieved.
6. Repeat steps 2, 3, and 4 after charge pump
relief valve is replaced.
7. if pressure still not in range, repair or
replace the pump as necessary.
RV4
Boom extend
relief valve
GP2

Skyjack SJ61T Specifications

General

Brand	Skyjack
Model	SJ61T
Category	Lifting Systems
Language	English