3
Pressure and Piping
1.
Composition of hydraulic equipment system.
When a pump, high pressure hose(s), cylinder, valve,
or couplings are connected together, always check product limitations regarding pressure ratings
and load capacities. The system operating pressure must not exceed the pressure rating of the lowest rated compo-
nent in the system.
2.
Pressure gauges.
Always install or prepare a pressure gauge in-line from the pump in order to monitor pressure.
3.
Piping.
Use wrapping of teflon tape on hose fittings, valves and couplers. Make sure all hose
connections are tight - use proper tools to tighten connections with reference to the following table.
DO NOT OVERTIGHTEN CONNECTIONS.
*Make sure that tape does not shed into the hydraulic system causing damage. Trim loose ends.
WARNING
!
CAUTION
!
NPT, PT
SIZES
TIGHTENING TORQUE
N-m (kgf-m)
1/8"
13-14 (1.3-1.4)
1/4"
30-40 (3.0-4.0)
3/8"
60-70 (6.0-7.0)
1/2"
100-110 (10.0-11.0)
Oil Exchange
The frequency of oil change depends upon general working conditions, severity of use, and overall
cleanliness. 300 hours (working time) of use or about 3 months is considered as a standard change
interval. Periodically compare samples of the reservoir oil with new oil. Inspect oil color for contaminants or differences.
Remove oil feeding plug and tilt the pump to drain out old oil. Be careful that impurities such as dust do not enter into
the reservoir and that new oil is filled up to the gauge level mark indicated in the pump. Precautions for oil change are:
a) Reatract all cylinders fully to the return position.
b) Do not fill with even a small quantity of replensihment of different kinds of oil.
c) Be careful that impurities or foreign matter do not enter into new oil.
Oil Safety Notes
When oil enters into the eyes, wash it away fully with clean water and consult a doctor immediately
In case oil enters into an open wound, wash it away with soapy water and quickly consult a doctor.
CAUTION
!
WARNING
!
Temperature Seal
NORMAL CONDITION
UNACCEPTABLE RISE IN OIL
TEMPERATURE HAS OCCURED
55
e) It is OK if the reservoir is filled with oil reaching to the upper bound of the oil gauge. Replenish of oil is short
(See
Maintenence
section) for hydraulic oil details.
f) Replace the oil feeding plug and screw it in by turning counterclockwise.
Operation
When using a pump with an opened type, turn the oil supply cork twice counterclockwise at the time of use.
NOTE: TURN CLOCKWISE AT THE TIME OF CONVEYANCE AND FASTEN THE OIL SUPPLY CORK. When using a pump
with a sealed type, use it with the oil supply cork fastened.
1. Close the release valve lever by turning clockwise and depress the "ON" switch to advance the plunger.
2. To retract the plunger, turn the valve lever counterclockwise to open the valve.
Maintenance
Hydraulic Oil
Use only ZINKO hydraulic oil or an approved high grade oil (ISO #32, viscosity: 32 cSt @40
o
C) with these pumps.
Oil Temperature
Aptitude temperature for use of hydraulic oil is maximum 55
o
C. If the color of the temperature seal attached to the tank
has changed and indicated "55" as shown below, an unacceptable rise in oil temperature has occured. STOP WORKING
IMMEDATELY to decrease the oil's temperature. Installation of an oil coller may be appropriate.
Zinko Hydraulic Jack
Models: ZPE-35RH-1M & ZPE-35RH-1MB