10.66 10.66 Electrical Electrical systemsystem
1010.1.15.5.77 PuPump mp mmototoror
The pump motor's speed The pump motor's speed gradually drops.gradually drops.
(High temperature on the pump (High temperature on the pump regulator)regulator)
Was the warning text “High tmpWas the warning text “High tmp
hydrau C” visible on the display whenhydrau C” visible on the display when
the symptom occurred?the symptom occurred?
šš
NoNo
Go to the next page, high pump motorGo to the next page, high pump motor
temperature.temperature.
YYeses
Check that the regulator fan works as itCheck that the regulator fan works as it
should by first removing the batteryshould by first removing the battery
plug and then restarting the truckplug and then restarting the truck
again.again.
Does the fan start within about 20Does the fan start within about 20
seconds?seconds? YYeses
Check that nothing obstructs the airCheck that nothing obstructs the air
flow through the regulator's heatsinks.flow through the regulator's heatsinks.
If the heatsinks are covered in dust orIf the heatsinks are covered in dust or
other objects, clean under these.other objects, clean under these.
NoNo
Connect a voltmeter and repeat theConnect a voltmeter and repeat the
procedure to check the regulator fan.procedure to check the regulator fan.
Is the voltage at least B+ 48V for a fewIs the voltage at least B+ 48V for a few
seconds after the fan has started?seconds after the fan has started?
YYeses
Change the fan.Change the fan.
NoNo
Is there B+ 48V on the fan?Is there B+ 48V on the fan?
šš
NoNo
Check the cables between the fanCheck the cables between the fan
contact X26.1 and contact X26.1 and the Athe ATC contactTC contact
XC5.19 carefully. If the cables are OKXC5.19 carefully. If the cables are OK
and the truck has no other faults,and the truck has no other faults,
change the change the AATC.TC.
YYeses
Check the cables between the fanCheck the cables between the fan
contact X26.2 acontact X26.2 and the And the ATC contactTC contact
XC5.12 carefully. If the cables are OKXC5.12 carefully. If the cables are OK
and the truck has no other faults,and the truck has no other faults,
change the change the AATC.TC.
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