Control Valves; Starting The Pump For The First Time; Adjusting The External Relief Valve - Simplex G6 Series Reference

5.0 CONTROL VALVES

2-Way Valve for Single Acting Rams
To Advance......turn lever to the right.
•
To Hold......turn motor off and leave in
•
advance position.
To Retract......turn lever to the left.
•
3-Way Manual Valve for Single Acting Rams
To Advance......push lever to the right.
•
For Neutral/Hold......place lever in the middle.
•
To Retract......push lever to the left.
•
4-Way Manual Valve for Double Acting Rams
To Advance......push lever to the right.
•
For Neutral/Hold......place lever in the middle.
•
To Retract......push lever to the left.
•

5.1 STARTING THE PUMP FOR THE FIRST TIME

• Place "hydraulic control valve" in neutral (center position).
• Place throttle to choke position (extreme right). Grasp "starter handle" and pull rope out slowly to engagement.
• Pull rope with a rapid, continuous full stroke and let rewind slowly, avoiding it snapping back.
• Move the control lever to "high speed" position, then to "run" as the engine warms.
Bleeding the Hydraulic System - air can be removed from the system by fully advancing and retracting the
hydraulic cylinder several times with the pump elevated so its reservoir is higher than the cylinder. Single-acting
cylinders should be inverted and double-acting on their side with the hydraulic couplers pointed up. When the
trapped air is removed from the hydraulic circuit, the cylinder will advance and retract smoothly. Sluggish or jerky
cylinder action is usually the first sign of air in the system.
Shift the lever to Advance position to activate ram or cylinder. To hold load, place lever into Neutral/Hold or turn off
pump. Move lever to retract position to release load.
CAUTION: Never operate the pump at 10,000 PSI (700kg/cm
without shifting the control valve to neutral or turning off motor. Leaving the valve in the advance or retract position
without the piston rod moving will overheat the oil.
CAUTION: Never disconnect or connect any hydraulic hoses or fittings without first unloading the ram, then unplug
the electrical cord of the pump and shift, or open all hydraulic controls several times to assure that the system has
been depressurized. If the system includes a gauge, double check the gauge to assure pressure has been released.

5.3 ADJUSTING THE EXTERNAL RELIEF VALVE

Pumps are preset at 10,000 PSI (700kg/cm
steps below.
1. Install gauge and gauge adapter between pump and cylinder.
2. Remove Acorn Nut to expose adjusting screw.
3. Place valve lever in Neutral/Hold position and start motor.
4. Move lever to direct pump output to pressure port (Advance).
5. Insert 7/32 Allen wrench into adjusting screw in the hole on the left side of
valve.
6. Turn adjusting screw clockwise to increase, or counter clockwise to
decrease pressure.
7. Do not exceed 10,000 PSI (700kg/cm
8. Check valve setting by shifting the valve to advance and retract cylinder
several times.
9. Maximum gauge reading should remain constant.
••• 5 •••
) without ram movement for more than 1 minute
2
). To re-adjust or lower the maximum operating pressure, follow these
2
).
2
High Pressure Relief
Adjustment Location
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