Problem
Remedy
Motor will not start
•
Check source of power.
•
Check overloads, fuses, control, etc.
•
Verify hydraulic control valves are in the "OFF"
position.
Power unit flow greater or less
than 10 GPM.
Note: If adjustments are to
be made, refer to calibration
system section, page 18
•
Check flow rate under load. With flow and
pressure test gauge (part #03600)
•
Attached to power unit, slowly “dial in” 1500 PSI.
Power unit should still deliver
•
9.5 – 10 GPM on the 10 GPM port with both
control valves on.
Bottom 5 GPM port drops flow
under load, and won’t deliver
2000 PSI
Relief pressure. Other ports ok.
•
Adjust flow control valve (part #0141-01). See flow
control setting from calibration procedures page
20.
•
Service precaution: do not take system relief valve
and flow control valves out and install them in the
wrong holes. If you do, damage to the pump will
result.
Hydraulic oil overheats
•
Check temperature with thermal measurement
device. If over 140 Degrees F. (60 Degrees
celsius), Check the following:
- Hydraulic oil to full mark in tank
- Adequate clearance for air circulation around power
unit.
Power unit should be moved so unrestricted air
movement is available In front, rear and sides of unit.
Remember, the cooler draws air from Around the
power unit. If the cooler can only draw hot exhaust,
captured Air next to bulkhead, or superheated air in
truck body hot hydraulic Oil will be the result.
•
Check tool flow rate. Operate 5 GPM tools
only on 5 GPM. Excess Flow at 10 GPM can
cause overspeeding of the tool or heat buildup
Depending on the tool design.
•
Make certain that only the control knobs needed
for the tool being used are turned on. Having both
knobs turned on and only using one 5 GPM tool
will allow fluid to be forced over the relief causing
over heating.
•
Check system for excessive back pressure. Back
pressure should not exceed 250 PSI - see back
pressure section page 34.
12 av 34
OPERATION AND MAINTENANCE MANUAL I ENG_OMM_ELECTRIC_POWER_UNIT_P01 I 30th November 2021
@Pandrol 2021
