Water Pump Belt Service

The water pump pulley is a split type. Adjust the belt tension by adding or removing shims between the water pump pulley sheaves.

    Warning
  • Risk of Injury
  • The unit can start at any time without warning. Press the OFF key on the HMI control panel, place the unit Service Switch (On/Off switch) in the Off position, and disconnect the battery before inspecting or servicing any part of the unit.
    Caution
  • Risk of Injury
  • Do not attempt to adjust belts with the unit running.

Parent topic: Engine Maintenance

Belt Removal

  1. Turn the unit OFF and disconnect the negative battery terminal to ensure unit cannot be operated.

  2. Access the front of the engine.

  3. Remove the (4) fan to spacer bolts. It may be necessary to loosen the fan shroud mounts to allow better access the bolts.

    1. Fan to Spacer Bolts (4) 2. Fan

  4. Move the fan forward into the shroud. DO NOT allow the fan to contact the radiator fins.

  5. Remove the (4) fan spacer nuts, spacer, pulley shims, washer, and outer pulley sheave. Make note of position and thickness of all pulley shims for reuse.

    1. Spacer Nuts (4) 5. Outer Pulley Sheave
    2. Fan Spacer 6. Shims that Set Belt Tension
    3. Extra Shims for Belt Tension Setting 7. Belt
    4. Washer    

  6. Remove the belt from the unit and inspect all pulley sheaves. Replace if excessive wear is found.

Belt Installation and Tension Setting

  1. Install the belt around the crankshaft pulley and water pump inner sheave hub.

  2. Install the outer pulley sheave, washer, extra shims, fan spacer, and (4) spacer nuts. Torque the nuts to specification: 6.6 ft-lbs (9 Nm).

    Important Belt tension is adjusted by adding, removing, or changing the thickness of shims between the water pump pulley sheaves. It is important to note the number of and thickness of any shims that are removed during service procedures.

  3. Check belt tension using a commercially available belt tension tool.

    Water Pump Belt Tension Specification
    New Belt 126 Hz (40 lbs)
    Field Reset (used belt) 118 Hz (32 lbs)

  4. Adjust shims as necessary by removing the (4) fan spacer nuts, spacer, washer, and outer sheave. Change the thickness or number of shims in Location 1. Extra shims are found and stored at Location 2 .

    • Additional shims can be purchased and are found in the unit’s parts manual.

    Location 1:

    Shims To Adjust Belt Tension

    Location 2:

    Spare Shims Kept Here

  1. After belt tension is set correctly, ensure the (4) spacer nuts are torqued to specification: 6.6 ft-lbs (9 Nm).

  2. Manually rotate the engine four revolutions or connect the unit battery and the unit for 1–2 minutes.

    Important Rotating the engine allows the belts to seat properly in the sheaves and ensures the (4) pulley nuts can be properly tightened.

  3. Position the fan back onto the fan spacer. Install the (4) fan to spacer bolts and torque to specification: 6.6 ft-lbs (9 Nm).

  4. Install fan shroud hardware (if removed).

  5. Connect battery terminals and verify unit function.