Low Drive Pressure Adjustment - Skyjack SJKB-40-D Operating Maintenance Instructions & Part List

LOW DRIVE PRESSURE ADJUSTMENT

1) Fully lower and retract boom.
2) Tee a 1000 PSI gauge into the port marked Ps on the drive pump. Refer to Figure 5-17.
3) Start engine, and check gauge reading with boom fully lowered and retracted. It should read 390 PSI.
4) Extend telescope 3 feet. Adjust Hi/Low relief valve to 250 PSI. Refer to Figure 5-18.
5) Remove gauge and test drive. With boom fully lowered and retracted high drive will be available. With the
boom above horizontal or extended, only low drive will be available.
PILOT PRESSURE HOSE
TO TURRET MANIFOLD
SECTION 5, Page 26
TEE A 1000 PSI
GAUGE INTO HOSE
AT Ps PORT
Figure 5-17. Drive Pump.
Figure 5-18. Hi/Low Relief Valve Location.
JUN. 1999
Ma40-516
HI/LOW RELIEF
VALVE
Ma40-510
Ps
PORT
SJKB-40-D, SJKB-40-D/F