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5.3 AIR MOTOR AND FILTER LUBRICATOR
The air motor is a precision built rotary motor. The top clearance (between rotor and bore) is .0015”. The total end
clearance (between the sides of the rotor and the end plates is .002”. The vanes take up their own wear and will last
5,000-12,000 hours, depending upon speed, method of oiling, operating pressure, and lend itself to operating pres-
sure above 100PSI (6.89 Bar-Metric). Allowing excess moisture or foreign particles from the air line to enter the motor
will nullify the guarantee.
A moisture trap and lter has been installed in the air line ahead of motor. For efciency of output and control of
speed, use air line of not less then 1/2” pipe size. When coupling or connecting the motor to a drive member, avoid
any end or side thrust on the output shaft and especially DO NOT HAMMER ON SHAFT.
The starting torque is more than the running torque and could vary depending on the position at which the vanes
stop in relation to the air intake port. The speed and torque can be regulated by using a pressure regulator or a sim-
ple shut-off valve. Lubrication is necessary for the shaft seal, and rust prevention. Each air powered jack is equipped
with an automatic air line oiler set to feed 1-3 drops per minute. Use simplex #18243 antifreeze oil. Excessive mois-
ture in the line can cause rust formation in the motor and might also cause ice to form in mufer due to expansion of
air through the motor.
NOTE: To adjust oiler drops, turn dial counter clockwise to “raise”, and clockwise to
“lower”.
If the motor is sluggish or inefcient, try ushing with solvent in well ventilated area. Disconnect the air line and
mufer and add several teaspoons of solvent. Rotate the shaft by hand in both directions for a few minutes, again
connect the air line and apply pressure slowly until there is no trace of solvent in exhaust air. (Keep face away from
exhaust air). Check the mufer felts for grease, dirt, etc. If dirty, wash them in solvent. Replace the felts and connect
the mufer. Relubricate the motor with a squirt of oil in the chamber. If the vanes need replacing, or foreign particles
are present in motor chamber, an experienced mechanic may remove the end plate apposite the drive shaft end.
DANGER: To prevent explosive hazard, do not pump combustible liquids or vapors through these
units.
5.4 ADJUSTING THE EXTERNAL RELIEF VALVE
Pumps are preset at 10,000 PSI (700kg/cm
2
). 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/cm
2
).
8. Check valve setting by shifting the valve to advance and retract cylinder several
times.
9. Maximum gauge reading should remain constant.
5.5 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.
High Pressure Relief
Adjustment Location