Hydraulic System 261
Inspecting the Pump
The hydraulic pump is powered by the vehicle engine through a drive shaft. The pump should be
visually inspected every working day.
NOTE: On some units, the pump is directly installed on a PTO with no drive shaft between them.
Figure 5-6
Pump
When inspecting the pump:
1. Start the engine and engage the hydraulic pump.
2. Check the pump turns freely without excessive noise or vibrations.
3. Turn OFF the pump and stop the engine.
4. Lock out and tag out the vehicle (see Locking Out and Tagging Out the Vehicle on page 14).
5. Check for oil leaks under the pump and at connection points.
6. If electrical problems occurred with the pump, see Troubleshooting on page 331.
Caution!
Very corrosive chemicals used to wash trucks may cause serious damage to the point where
the valve coils may crack due to these chemicals. These issues can occur if the potting in the
PVE is experiencing prolonged exposure to diesel- or kerosene-type liquids.
Be careful when washing your truck especially around the proportional valve. Use
noncorrosive chemicals as much as possible to avoid corrosion problems such as those
reported. Soap and water pressure are good alternatives to strong corrosive chemicals.
Caution!
If the unit has to be driven away for repairs on the hydraulic system, remove the drive
shaft between the engine and the pump before restarting the engine.
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