41
Western Shotcrete Equipment, Inc.
TROUBLESHOOTING
1 Pumping
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.
Should 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 pro
-
ducing 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 gener
-
ate a lot of heat. Also check the built-in relief valve in the hand operated triple spool valve for proper opera-
tion.
To Next Page
Loading...