Skyjack SJ61T, Service Manual

Page: 215 / 232

Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007 Page 215
Section 5 - Procedures Service and Maintenance
5.8-4 Hydraulic System Relief Valve
Adjustment
1. To adjust the system relief valve (RV1), you
are required to temporarily adjust the high
pressure setting on the system pump to
3300 psi. Refer to 5.7-3 Hydraulic High
Pressure Adjustment .
2. Locate the GP2 port on the main manifold
and remove the cap.
Pressure Gauge
Cap
GP2 Port
Main Manifold
Main Manifold and Pressure Gauge
3. Connect a pressure gauge (5000 psi) to the
GP2 port.
4. Start the engine from the base control
console and let it run for 2-5 minutes.
5. Steer fully to one direction and then check
the reading on the gauge. Standard pressure
should be 3250 psi. Follow the next steps for
adjusting pressure if needed.
6. Locate the system relief valve (RV1).
Main Manifold
7. Loosen the lock nut on the system relief
valve. Turn the adjusting stem clockwise to
increase pressure and counterclockwise to
decrease pressure.
8. Tighten the lock nut on the system relief
valve once 3250 psi is observed on the
gauge. You must steer fully in one direction
to activate pressure reading on gauge.
9. Reset the system pump to 3050 psi. Refer to
5.7-3 Hydraulic High Pressure Adjustment .
RV1
System relief valve