System And Lift Pressure Adjustments - Skyjack SJ-7027 Operating, Maintenance And Parts Manual

All adjustments
Refer to the Serial Number Nameplate located on the rear of the machine for System and Lift Pressure values.
SYSTEM RELIEF PRESSURE ADJUSTMENT
1. Locate the Right Steer Hydraulic line at the Main Manifold. (Refer to Hydraulic Manifold Component and
Port Identification found in SECTION 3 for location.)
2. Tee in a Calibrated 3000 PSI Gauge into the Right Steer line.
3. Remove the Operator's Control Box from the guardrail and disconnect it from the Scissors Control Cable.
4. Locate the Electrical Panel Cable Plug in the Hydraulic/Electric Cabinet.
5. Disconnect the Scissors Control Cable and connect the Operator's Control Box Cable.
6. At the Main Manifold, loosen the locknut on the System Relief Valve (R1). (Refer to Hydraulic Manifold
Component and Port Identification found in SECTION 3 for location.)
7. Select "DRIVE" position with the Lift/Drive Select Switch on the Platform Control Box.
8. Engage Steer Right Switch on the top of the Controller Handle and hold.
9. Check the reading on Pressure Gauge. Adjust the System Relief Valve (R1) to the pressure listed on the
Serial Number Nameplate.
Turning the stem counter-clockwise decreases pressure.
10. Release the Steer Switch and retighten the locknut on the System Relief Valve (R1).
11. Remove the gauge from the Steer line.
LIFT PRESSURE ADJUSTMENT
1. Locate the Lift line coming out of the Main Manifold. (Refer to Hydraulic Manifold Component and Port
Identification found in SECTION 3 for location.)
2. Open the Manual Lowering Valve with the platform fully lowered. Remove the Lift line from the Main Manifold.
3. Install a 3000 PSI Gauge into the Lift line port fitting on the Main Manifold. Plug the Lift line going to the Lift
Cylinders.
4. Loosen the locknut on the Lift Relief Valve (R2). (Refer to Hydraulic Manifold Component and Port Identification
found in SECTION 3 for location.)
5. Close the Manual Lowering Valve. Using the Base Controls in the Hydraulic/Electric Cabinet, depress and
hold the Up Push-Button Switch.
6. Observe the reading on the gauge. Adjust the Lift Relief Valve (R2) to the pressure listed on the Serial
Number Nameplate.
Turning the stem counter-clockwise decreases pressure.
7. Release the Up Push-Button and retighten the locknut on the Lift Relief Valve (R2).
8. Remove the gauge from the Lift line port fitting and reinstall the Lift line.
SECTION 5, Page 8

SYSTEM AND LIFT PRESSURE ADJUSTMENTS

MUST be made with a Calibrated Hydraulic Gauge.
NOTE: Turning the stem on the Relief Valve clockwise increases pressure.
FULLY LOWER THE PLATFORM
NOTE: Turning the stem on the Relief Valve clockwise increases pressure.
ENSURE THAT THE MACHINE DOES
NOT LIFT MORE THAN RATED LOAD
June 2001
SJ-600 Series Engine Powered 112715