Form No. R92.00 Rev. 10/03
5
Problem
Possible Cause
Look For
Fluid
Faulty reservoir
Fluid level too low
overheats
Entrained air in fluid
(continued)
Improper, or no baffles
Poor air flow, or ambient air temperature
too high around reservoir
Heat pick up from adjacent equipment
Decrease in
Loose compensator adjusting screw
Tighten adjusting screw ( No.11 in
set pressure
Fig. 14, exploded view)
Defective function or relief valves
Repair or replace relief valve
Check relief valve setting
Reservoir fluid level too low
Replenish fluid
Check drain (below 5% of discharge at
rated pressure)
Deteriorating pump performance
Check pump internal components for wear,
repair or replace as needed.
Pressure
Pump turning backward
Change the rotating direction
does not rise
Reservoir fluid level too low
Replenish fluid
Relief valve or compensator set wrong
Readjust and lock
Relief valve or compensator defective
Repair or replace
Clogged suction line
Inspect and clean suction strainers
Open gate valve
Deteriorating pump performance
Check pump internal components for wear,
repair or replace as needed.
Insufficient
Reservoir fluid level too low
Replenish fluid
flow
Suction line not sealed
Tighten fittings
Improper pump stroke control adjustment
Readjust as required
Repair or replace as required
Deteriorating pump performance
Change compensator
Worn compensator
TROUBLESHOOTING GUIDE (continued)
CAUTION – Before performing any service
operation on any pump, be sure that all
pressure has been relieved from BOTH
SIDES of the system.
CAUTION – Before performing any service
operation on any pump, disconnect or lock
off power supply.
CAUTION – Do not attempt to remove the
Barrel Spring. The Barrel Spring is
assembled under high compression. Any
attempt to remove the Barrel Spring will
cause sudden decompression, and may inflict serious
personal injury. The Barrel Spring is NOT field
serviceable. Should the Barrel Spring require service,
the pump must be returned to Continental Hydraulics
or an Authorized Repair Center.
1. Please refer to the exploded view (Figure 14
through 17) for proper names and locations of all
parts.
2. Pump disassembly for inspection and repair should
be undertaken only in the following cases:
Malfunction or leakage due to damage or
wear.
When troubleshooting procedures contained
in this manual do not solve a problem.
3. Disassembly should be done only as far as
necessary to replace or repair worn parts.
4. Perform assembly and disassembly in a clean
environment.
5. Avoid dropping, damaging or contaminating the
machined parts of the pump and compensator.
6. After disassembly, coat the internal parts with a film
of clean oil, and protect them from dirt and moisture.
7. Prior to disassembly, measure and record the
length of the protruding part of adjusting screws (22)
and (28-11) from Figure 14, and if necessary, (18)
from Figure 16 or 17. This will simplify resetting the
pump after reassembly.
PISTON PUMP DISASSEMBLY
Precautions
