SERVICE 1400H OPERATOR AND SERVICE MANUAL
5-42 Published 10-30-2014 Control # 040-09
Troubleshooting
OIL COOLER SERVICE & MAINTENANCE
(OPTIONAL)
The heat exchanger must be kept clean to allow for
efficient operation of the cooler system. Frequent washing of
the heat exchanger core will eliminate oil film, road dirt and
other foreign object buildup on the heat exchanger fins which
reduces cooling efficiency.
Frequent inspection and tightening of hose clamp line
connections will eliminate the possibility of end connection
failure due to back pressure from cold startup. If cooler
system fails to provide adequate performance, reduced air or
oil flow through the heat exchanger is the probable cause.
The cooling fan should be inspected for proper operation
(see Specifications). Any obstructions in airflow should be
corrected (cooler too close to other truck components,
foreign matter in heat exchanger fins, etc. All hydraulic lines
should be periodically checked for obstructions, hose kinks
or other flow restrictions.
Symptom Possible Cause(s) Corrective Action
Will not lift load 1. No oil in system
2. Release valve not closed
1. Add oil to reservoir tank through oil filler
hole
2. Turn handle clockwise tightly
Will lift load only part way Oil level low Add oil to reservoir tank through oil filler hole
Will lift load but will not hold 1. The following valve or valves leaking:
a. Suction valve
b. Delivery valve
c. Release valve
2. Packings worn out or defective
1. Replace jack
2. Replace jack
Jack will not lower Release valve stuck, probably dirt or
foreign matter
Transfer load then replace dirty oil, flush oil
reservoir with kerosene
Poor lifting 1. Dirty oil
2. Air in hydraulic system
1. Change hydraulic oil
2. Purge air from system
Poor pumping action Oil seal for pump unit worn out or
defective
Replace jack
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