Satellite Maintenance Service Truck - Manual (Page 4)

TROUBLE SHOOTING GUIDE
SYMPTOM POSSIBLE CAUSE REMEDY
1. No vacuum at wand end, gauge
registers vacuum. A. Plugged valve or hose A. Clear obstruction in hose. (To clear hose, reverse
ends and draw obstruction out of hose using tank
vacuum.)
B. Overflow check valve closed
waste compartment full B. Empty waste tank and release vacuum between
pump and overflow valve by opening secondary ball
valve. Check overflow valve for obstruction. Clean as
necessary to loosen ball.
2. Vacuum pump turns but produces
no vacuum or no vacuum is
indicated. A. Secondary ballcheck valve
closed. A. Open and drain ballcheck ball valve.
B. Vacuum gauge broken or sticky. B. Replace gauge
2C. Vacuum pump turns but
produces very loud noises and
chatters. C. Exhaust line from pump
plugged, or frozen. C. Check carbon pot, drain muffler, check hose for
obstruction, or thaw as necessary.
3. Vacuum pump turns but produces
only little vacuum A. Pump is excessively dirty
causing some vanes to stick in
rotor slots. A. Flush pump with a pint of diesel fuel using the
standard flushing procedure. See pump manual.
B. Several small leaks in vacuum
hose between tank and pump. B. Repair leaks/replace hose.
C. Rotor vanes worn or broken C. Replace vanes
D. Vanes swollen, stuck in rotor
slot. Replace vanes. See rebuild procedure in pump
manual.
4. Vacuum pump shaft not turning A. Fuse powering electric clutch
blown. A. Replace fuse.
B. Clutch failure. B. Replace clutch
C. Wiring problem. C. Repair/replace wiring.
5. Idle control does not advance
engine speed when button is pushed. A. Parking brake not applied A. Apply parking brake.
B. Clutch or brake pedal sensors
out of adjustment. Have Ford dealer or mechanic adjust sensor brackets
and pedal travel.
6. Cannot dump waste A. Dump valve plugged. A. With vacuum on tank, quickly and repeatedly cycle
dump valve open and closed. Release vacuum and
dump.