Jergens Work Holding Solutions - C-Box Pump, Use and Maintenance Booklet - 4-06-16
Page 8
Start Up Procedures
Oil pressure can be determined by regulation of the compressed air, bearing in
mind the multiplication ratio pre-selected for the pump itself and frictional losses.
The models are:
61763 & 61764
Nominal Ratio 20:1
61765 & 61766
Nominal Ratio 60:1
For instance, when supplied with compressed air at 100 psi, a 20:1 pump will
produce oil pressure of approximately 2,000 psi when completely stalled. It should
be remembered that the real hydraulic performance produced by the pump is
always slightly less than that given by the theoretical calculation because of small
frictional losses from both air and oil seals.
After the pump suction is connected to the oil supply, connect the compressed air
supply at a low pressure (20 PSI recommended). Allow the pump to operate slowly
until it is primed and oil comes through to the output port or closest circuit
connection. Now shut off the air supply to the pump and securely connect to the
hydraulic circuit. Switch on the air supply again and allow the pump to run in order
to bleed all the air from the hydraulic circuit. With the circuit fully primed, the air
supply pressure can be increased to the level required for the intended hydraulic
performance.
Remember to ensure the safety of all persons in the vicinity when this procedure is
undertaken and allow for any high-pressure leakage there may be during the
testing phase.
