Jergens Work Holding Solutions - C-Box Pump, Use and Maintenance Booklet - 4-06-16
Page 9
Fault Finding Chart
Fault
Cause
Remedy
1] Pump does not
1.1] Air valve spool
1.1] Clear blockage or
cycle or only runs
stuck in its mid position.
replace valve assembly.
slowly.
1.2] Formation of ice
1.2] Shut off the pump for a
on the exhaust side.
short time and drain off
water from the filter.
1.3] Blockage in the
1.3] Remove the
muffler or breather.
muffler/breather,
clean or replace.
1.4] Blocked element in
1.4] Shut off air supply,
air filter/regulator.
dismantle and clean filter.
2] Air escaping from
2.1] Worn air valve or
2.1] Replace valve or seal.
muffler or breather.
air piston seal.
3] Excess oil leakage
3.1] Worn hydraulic seal.
3.1] Replace seal.
from muffler/breather.
4] Pump cycles without 4.1] Blocked suction line.
4.1] Clean out filter.
pumping oil.
4.2] Bad connection on
4.2] Check for bad
suction line.
connections or air leaks on
suction line.
4.3] Check valves blocked
4.3] Clean or replace
or worn.
valves.
5] Pump functions but 5.1] Internal leakage in the
5.1] Find leak source and
only generates low
circuit downstream.
change component.
pressure and does not 5.2] Suction valve seats
5.2] Replace suction valve
stall at maximum
damaged and leaking.
parts.
pressure.
5.3] Output valve seats
5.3] Replace output valve
damaged and leaking.
parts.
5.4] Worn oil seal.
5.4] Replace seal.
Maintenance
Periodically release the condensation from the air filter drain. Replace the hydraulic
oil every 1500 hours or whenever the oil is polluted. Clean the mufflers on the pump
and reservoir periodically. Schedule pump overhauls before seals fail.
Warning
: Remember that repairs can only be made when pneumatic and hydraulic
pressure has been released and you are sure that no pressure remains in the circuit.
