2 MAINTENANCE
TROUBLE-SHOOTING CHART
PROBLEM
UNIT WILL NOT START
UNIT WILL NOT CONTINUE RUN-
NING WHEN START BUTTON IS
RELEASED
MOTOR RUNS BUT PLATEN DOES
NOT MOVE NORMALLY
UNIT WILL NOT REVERSE
PUMP MAKES NOISE, SOUNDS
LIKE GRAVEL INSIDE
CAUSE
( 1) No electrical power to unit
( 2) No electrical power to control circuit
( 3) No electrical power to motor
( 1) Relay or contacts are inoperative
( 2) Motor Starter auxiliary contacts are
inoperative
( 3) Secondary contact on start button
is inoperative
( 1) Insufficient oil in reservoir
( 2) Low relief pressure
( 3) Oil leakage in cylinder
( 4) Defective pump
( 5) Oil leakage from hose fittings
( 6) Low voltage
( 7) Pump may be driven in the wrong
direction of rotation
( 8) Pump shaft broken, or shaft key
sheared
( 9) Intake pipe from reservoir blocked,
or oil viscosity too heavy to prime
(10) Intake air leaks (foam in oil or
sounds like gravel in pump)
(11) Units shift slowly
(12) Valve response sluggish
(13) Loose hub coupling
( 1) Solenoid valve is inoperative
( 2) Reverse button inoperative
( 3) Timer T2 inoperative
( 1) Partly clogged intake strainer or
restricted intake pipe
( 2) Defective bearing
( 3) Air leak at pump intake pipe joints
SOLUTION
( 1A) Turn on main disconnect
( 1B) Replace fuses or reset breakers
( 2A) Check primary and secondary sides of
transformer
( 2B) Check for correct voltage. Check con-
trol fuses.
( 2C) Check stop button
( 2D) Check start button to be sure contact
closes when depressed
( 2E) Check magnetic interlock.
( 3A) Check heater resets
( 1A) Check relay coil, contacts, & wiring
( 2A) Check motor starter contacts and wiring
( 3A) Check contact to be sure it is operating
properly. Check wiring.
( 1A) Fill reservoir with oil
( 2A) Check relief pressure
( 2B) Clean orifice in relief valve & reset pres-
sure
( 2C) Check o-rings on relief valve for dam-
age or leakage
( 3A) Check cylinder for bypassing
( 3B) Replace seal kit, inspect rod and cylin-
der tube for scoring or nicks.
( 3C) Replace cylinder
( 4A) Replace pump
( 5A) Tighten hose fittings
( 6A) Check voltage
( 7A) Stop immediately to prevent
seizure.Check direction of drive rotation (prop-
er rotation direction is indicated by arrow on
motor)
( 8A) Visually inspect motor and pump shaft
and hub couplings for damage. Replace if
necessary.
( 9A) Drain system. Add clean fluid of proper
viscosity and specifications. Filter as recom-
mended. Check system filter for cleanliness.
(10A) Check intake connections. Tighten
securely and flush system.
(11A) Flow control valve (restrictor) clogged ,
remove and clean orifice.
(12A) Contaminated oil needs replacing.
(12B) Inadequate voltage, check voltage,
check coil
(12C) Disassemble valve and clean
(13A) Tighten set screws on hub coupling
halves
( 1A) Check coil in solenoid valve
( 2A) Check reverse button contacts
( 3A) Check T2 contact to see if it is opening
( 1A) Pump must receive intake fluid freely or
cavitation results. Drain system, clean intake
pipe and clean or replace strainer
( 2A) Replace pump
( 3A) Tighten joints as required.
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