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5.2 STARTING THE PUMP FOR THE FIRST TIME
1. Locate the valve control and make sure it’s in the “neutral” or “open” position.
2. Locate the power switch and select to the “ON” position. Check for any leaks, repair as needed.
3. Shift the control valve to the closed, advance and retract position and look for movement in tool or cylinder.
Check for any leaks, repair as needed.
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/cm2) without ram movement for more than 1 minute
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/cm2). To re-adjust or lower the maximum operating pressure, follow these
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/cm2).
8. Check valve setting by shifting the valve to advance and retract cylinder several
times.
9. Maximum gauge reading should remain constant.
5.4 JACKING SAFETY
Know the weight you intend to lift and select a cylinder with enough capacity to provide the appropriate factor of
safety. Appropriate factors of safety vary with the type of load to be lifted and number of lifting points. Prepare a
lifting plan that accounts for potential changes in load factors such as; load shift, center of gravity, and stability.
Choose a cylinder with at least 10% more capacity than is required by the lifting plan.
The ram should be placed on a solid foundation so that the base of the ram is fully supported. The load must be
centered on the ram, or equally distributed on multiple rams. Off center loading can result in the ram slipping out and
loss of the load.
Never crawl or place any part of your body under any load at any time. Insert blocking or cribbing under the load as
you lift. Hydraulic rams are meant for lifting only and should not be used to support the load for any period of time.
You should obtain and be familiar with the American National Standards Institute rules that apply to hydraulic rams
and jacks (ASME ANSI B30.1).
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