18
2 MAINTENANCE
PROCEDURES
PRESSURE SETTING INSTRUCTIONS
When the hydraulic cylinders used in the RamJet Self-Contained compactor are fully extended
or retracted, they bypass internally. This makes it impossible for the hydraulic system to reach
relief pressure. Follow the recommendations below for proper pressure setting.
1. Disconnect and lock-out power per the procedure on page 16.
2. Using the quick disconnects, disconnect the hydraulic hoses from the compactor.
3. Remove the 1/4” plug from the check valve and install a 0-3000 psi pressure gauge.
4. Loosen the lock nut on the relief valve and turn the adjustment screw several turns
counterclockwise.
5. Remove the lock-out provisions and turn the disconnect to the ON position. Start
the power unit using the OPERATING INSTRUCTIONS on page 7 and 8.
6. With the hoses disconnected, the power unit will build pressure. Adjust the relief
pressure up by turning the relief adjustment screw clockwise. Adjust the relief valve
to the desired pressure setting and tighten the lock nut. See chart below.
7. Press the EMERGENCY STOP button to stop the power unit, and relieve the stored
hydraulic energy as described on page 16.
8. Disconnect and lock-out power as described in Step 1.
9. Remove the pressure gauge and replace the 1/4” plug in the check valve.
10. Reconnect the hydraulic hoses, and remove the lock-out provisions.
PRESSURE SETTINGS
MODEL NO.
HP
GPM
RELIEF
VALVE
SETTING
RES.
CAP.
BORE
ROD
STROKE
RJ-88SC 5 6 1700 15 4 2 1/2 25
RJ-100SC 10 10 1850 20 5 2 1/2 42
RJ-250SC 10 10 1850 20 4 2 1/2 31 5/8
RJ-250 Ultra 10 10 1850 20 4 2 1/2 31 5/8
On units with the Advance Warning Light, set pressure 200 PSI below pressure switch setting.
Includes HT units & SL units.
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