Owner`s manual

OPERATION — PAGE 8
WILLIS POWER SYSTEMS
REQUIRED MAINTENANCE SCHEDULE
Performing simple maintenance checks, and following the schedule
will result in a long lasting engine that improves the performance of
your APU, the life of your unit, and long term savings on the road.
Ignoring the maintenance schedule can result in a void warranty,
and/or preventable engine problems.
Every 50 Hours of APU Runtime
• Check the APU engine oil level on dipstick
Every 500 Hours of Runtime
• Check and/or change thermostat batteries
• Replace the APU’s engine oil and lter
• Replace the APU engine fuel lter
• Disconnect/clean ALL grounds and power connections & reseal
with Plasti-Dip or equivalent.
• Check the engine air lter
• Check belts and hoses for wear
• Check wires, harnesses, clamps, & tie wraps for wear
Every 2000 Hours of APU Runtime
• Check the fuel hoses on the APU
• Check the ve water hoses on the APU
• Replace the APU engine’s water pump belt
Engine Oil
Use SAE 15W-40 engine oil for all temperatures. Oil should meet
API classication CC/CD/CE and be replaced every 500 hours of APU
runtime or when truck’s oil is changed, whichever comes rst.
Engine Coolant
Low-silicate 40% permanent anti-freeze by volume for temperatures
down to -12ºF and 50% by volume below -12ºF.
The Willis APU Cab Controller is mounted on the truck’s instrument
panel. The Cab Controller’s menu screen shows all selected actions.
• When the APU has power, it will display a menu saying “Select
Mode” or “Shutdown.”
• When the Controller is not in use it will cycle between being
blank and being on at half brightness. This is normal.