23
Troubleshooting
Pump cylinders are making very short strokes and
S-Tube is switching rapidly back and forth.
Probable cause: Out of sync
The pumping cylinders can become out of sync
when idling a long period of time between trucks.
If the cylinders become out of sync simply put
the machine in pressure test mode by setting the
Pressure test switch to “Press Test” and turning
on the pump. Through the water-box window,
observe the retracting ram. When the ram has
fully retracted turn the pump off and the set the
pressure test switch to the normal (Pumping)
position: this will place the rams in sync.
Overheating Hydraulic Fluid
Probable cause: Heat generation.
Heat is generated in a hydraulic system whenever
oil dumps from a higher to a lower pressure
without producing a mechanical work output. Bad
o-ring seals, worn or improperly adjusted valves,
and/or worn-out hydraulic pumps can cause this.
Examine the o-ring seals on the four logic valves
(83300) in the cycle block (83318). Examine the
o-ring seals and the setting of the main relief
valve Examine the o-ring seals and the setting of
the unloading relief (83411) and check valves.
(83410) Examine the o-ring seals and the proper
function of the accumulator dump valve. (83406)
Measure the temperature of the tandem gear
pump (83701) while the machine is in operation.
It should only be about 10” higher than the
tank temperature. If the pump temperature
is excessive, or it struggles to charge the
accumulator it should be replaced.
Cooling fan failure.
If both of the cooling fans (83719) are not
operating the hydraulic system will overheat
rapidly. Does the override switch operate the
fans but not the temperature switch? Use a test
light and check the temperature switch on top of
the hydraulic oil cooler for proper operation. The
switch should turn on at 120°.
Do the fans not work at all? Examine the
fan relay for proper operation.
Remixer motor.
Examine the remixer motor (83780) operation. Is it
turning unusually slow? A worn remixer motor will
generate a lot of heat. Also check the built-in relief
valve in the hand operated triple spool valve for
proper operation.
Engine runs, but hydraulic system will not pump.
Probable cause: Hopper Grate Open
Check to ensure grate is fully closed.
Probably Cause: Faulty Safety Switch
Switch safety override switch at panel to verify
pump will work if switch is disengaged.
Probably Cause: Blown fuse.
Open control panel and locate fuse box at bottom
of panel and check fuse labeled "Safety Switch".
Replace fuse if blown.
To Next Page
Loading...