
2
Preventive Maintenance
IMPORTANT: Any repair or servicing that requires dismantling that pump must be performed in a dirt-free environment
by a qualified technician. Dispose of machine fluids properly.
Lubrication
For Hand/Foot Pumps: If the pump is operated on a continuous duty cycle for extended periods, the manufacturer
recommends installing an automatic air line oiler in the air inlet as close to the pumping unit as possible. Set the unit to
feed approximately one drop of oil per minute into the system. Use SAE No.10 Oil.
Bleeding Air From the System: During the first moments of operation after prolonged use, a significant amount of air
may accumulate within the hydraulic system. This entrapped air may cause the cylinder to respond slowly or behave in
an unstable manner. To remove the air, run the system through several cycles (extending and retracting the cylinder)
IMPORTANT: Seal all external pipe connections with high grade thread sealant. Teflon tape may also be used to seal
hydraulic connections, provided only one layer of tape is used. Apply the tape carefully, two threads back, to prevent it
from being pinched by the coupler and broken off inside the system. Any loose pieces of tape could travel through the
system and obstruct the flow of fluid or cause jamming of precision-fit parts.
For Hand/Foot Operated Pumps:
1. To extend the cylinder, depress the pedal on the end marked "PUMP".
2. To hold the cylinder in position, release the end of the foot pedal marked with "PUMP" to deactivate the pump.
3. To retract the cylinder, depress the pedal on the end marked "RELEASE".
2-Stage Pumps
On two-stage pumps, the air pressure regulator that is mounted on the pump controls only the output from the high
pressure stage. The output of the low pressure stage of the pump is determined by the air line pressure coming from the
remote regulator. A remote regulator is required to control the air pressure from the line. The independent functioning of
the low and high pressure stages of this pump can be best described as follows: At the minimum air line pressure of 40
psi (3 bar), the low pressure stage of the pump will deliver 480 psi (33 bar) hydraulic pressure (with the pump regulator
turned counterclockwise to prevent air pressure from activating the high stage of the pump). At the minimum air line
pressure of 40 psi (3 bar) the high pressure stage of the pump will deliver 4,000 psi (275 bar) hydraulic pressure (with
the pump regulator turned clockwise to allow air pressure to reach the high pressure stage). Always remember that the
pump regulator must be turned fully counterclockwise when the pump is used to produce 1,200 psi (83 bar) or less.
For Pumps With Air Regulators:
1. Open the air shut-off valve (if so equipped) or connect the air quick coupler (if so equipped). NOTE: Under certain
circumstances the pump may need to be primed before operation.
2. Slowly turn the air regulator control on unit clockwise to increase pressure, counterclockwise to decrease pressure.
As air is admitted to the pump unit, it will begin to deliver fluid to the system. Continue to slowly turn the air
regulator control clockwise until the gauge reads the maximum hydraulic pressure rating as stated on the pump's
data plate. A maximum hydraulic pressure reading should be obtained is air pressure is approximately 100 psi (7 bar).
3. Cycle the system several times by manually shifting the 3-way/4-way valve (if so equipped) or the remote valve (if
so equipped). Set the air regulator to obtain the desired hydraulic pressure. When decreasing air pressure, shift the
valve after each adjustment before measuring actual hydraulic pressure.
4. Shut off and disconnect air supply to the pump and shift pump valve (if so equipped) or remote valve (if so equipped)
two times to release all system pressure. Check fluid level with the hydraulic system retracted. THE PUMP IS NOW
READY FOR OPERATION. Note: The Hydraulic pressure is increased or decreased by adjusting the air inlet pressure
at the regulator.
Activating the pump with the pedal end marked with
this picogram, the fluid is directed out of the reservoir.
Activating the pump with the pedal end marked with
this picogram, the fluid is directed back to the reservoir.
Pump Operation
PUMP RELEASE
Priming the Pump Unit
Under certain circumstances it may be necessary to prime the pump unit. To do so, follow these instructions:
For Hand/Foot Pumps:
1. Press the release end of the pedal while holding down the air intake valve with a flattened screwdriver. The air intake
valve is located directly under the pedal in the area marked "PUMP". The air intake valve is depressed simultaneously
with the "RELEASE" area of the pedal during priming.
2. Allow the pump to cycle for approximately 15 seconds.
3. Remove the screwdriver, and press the "PUMP" end of the pedal once more.
4. If the cylinder extends or pressure builds, the pump has been successfully primed. If the pump does not respond,
repeat the procedure, jogging the air intake valve while holding the pedal in the "RELEASE" position.
Zinko Hydraulic Jack
Models: ZAP Series Operating Instructions (continued)