Carver Inc 5-1
SECTION FIVE MAINTENANCE
Each CARVER Laboratory Press is thoroughly tested to provide trouble-free performance. Manufacturing and
assembly processes are closely controlled in our factory under rigid inspection and testing procedures. Follow these
instructions, and with proper care, your press should give many years of trouble-free service.
5.1 TROUBLESHOOTING
To maintain constant pressure, the hydraulic unit may require occasional pumping, especially when pressing against a
soft or yielding material. If the pressure drops slowly as shown on the gauge, it should be considered normal. If you are
experiencing problems with the operation of your hydraulic unit, it may be due to any of the following reasons:
PROBLEM POSSIBLE CAUSE SOLUTION
Rapid drop in
pressure
a) Low oil level due to leakage.
b) Open release valve.
c) Worn or dislodged internal packing.
d) Dirty valve seat.
e) Air entrapment.
a) Tighten hydraulic connections and
refill with oil.
b) Close release valve.
c) Replace packing or seals where
necessary.
d) Remove release valve & clean valve
seat. Hydraulic unit may require
flushing with solvent, such as agitene.
e) Purge air from system (see Air Bleed
Procedure in Section 5).
No pressure when
pumping
a) Open release valve.
b) Worn packing in pump.
c) Release valve ball missing.
d) Release valve contaminated.
a) Close release valve.
b) Replace or rebuild hydraulic unit
pump.
c) Replace ball.
d) Remove and clean.
Slow drop in
pressure
a) Open release valve
b) Worn release valve seat.
c) Worn ram seal
a) Close release valve.
b) Contact factory for replacement.
c) Replace ram seal.
Oil leakage in
gauge coupling
a) Loose gauge fitting.
b) Gauge not sealing.
a) Tighten gauge fitting.
b) Add copper gauge seal (maximum of
two)
NOTE: Refer to the exploded view drawing accompanying this manual for the location of seals, packing, and gaskets
in the hydraulic unit.
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