Greenlee Textron / Subsidiary of Textron Inc.
6
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
940-PS Series Hydraulic Power Pumps
Minor Hydraulic Trouble Chart
The hydraulic unit should be observed constantly for
out-of-the-ordinary performance and unusual noises.
If any of these are present, shut off pump and take
corrective steps immediately to avoid possible expen-
sive repairs later on. In most cases, a minor repair will
solve the problem but it is suggested that, if trouble
continues, the unit should be returned to the factory or
to a qualified service center for the proper repair. Under
no conditions allow unqualified personnel to attempt to
repair the pump, particularly the pump block unit, as
serious, irreparable damage may result.
POSSIBLE REMEDY
PROBLEM
PROBABLE CAUSE
Improper advance or return.
Air in circuit, oil supply low.
Add oil. Run unit to work out air.
Dirt system, causing valves to lock
Flush out entire oil system and fill with
open.
new oil (see page 5).
If trouble is not cleared up by above
Drain oil (page 3). Next remove pump-
remedies, trouble may be due to dirty
ing unit cover and clean or replace
or plugged-up screen.
screens (17).
CAUTION: Do not operate pump
without screens, as particles of dirt
will be sucked into pump and valve
mechanism, seriously damaging
valve seats.
Unable to reach pressure.
Same as above.
Same as above.
Necessary to add oil often.
Oil leaks.
Check for broken lines, and loose
fittings or connections.
Noise in hydraulic system.
Air in system. Low in oil.
Add oil (page 5). Run pump to work
out air.
If the above corrective measures fail to make the pump function, it is recommended that you send the pump back to
the factory or to a qualified service center.
