GMC 1976 ZEO 6083 Maintenance Manual page 828

24L- 2
HOLDING TANK AND DRAINAGE SYSTEM
TROUBLE DIAGNOSIS
Problem
Possible Cause Correction
Monitor panel gauge in- 1 . Refer to "Monitor 1 . Refer to "Monitor Panel-Trouble
operative. Panel-Trouble Diagnosis" Diagnosis" in Section 24B.
in Section 24B.
Holding tank leaks. l . Seal may be damaged or l . Refer to "Holding Tank-
misaligned at the tank Fittings" later in this section .
sending unit or
fullway dump valve.
2. Loose or misaligned 2 . Remove tank and correct. Refer
fittings on top of tank .
to "Holding Tank-Removal", and
"Fittings" later in this section.
3. Tank has been 3 . Refer to "Holding Tank-
punctured.
Repair" later in this section.
Holding tank plugged up 1 . Determine if anything 1 . Flush tank adequately, add a tank
and won't empty .
was dropped into tank to
chemical to eliminate odor during
cause the situation. final flush. Remove fullway valve.
Refer to "Holding Tank" later in
this section. Try fishing object
out through opening.
2. Sediment has accumul- 2. Use a plumbers flexible probe
ated enough to block to break accumulation open .
fullway valve opening. CAUTION: Use a hand turned
(The recommended use probe, not a power driven probe.
of bio-degradable The power driven probe may damage
should prevent this). the plumbing lines .
NOTE : Once unplugged the
contents will quickly drain so be
prepared and have dump hose aimed
in the desired direction.
Holding tank contents 1 . The shower trap is the
1 . Caution owner to dump holding
backs up through shower
lowest point of the drain-
tank more frequently .
trap and onto bathroom age system and an over
floor. full holding tank will
back up contents at this
point.
_ 2. Install drainage plug in shower
drain.
Clogged drain. 1. Accumulation of grease, 1 . Remove "P" trap and clean.
hair, etc. Refer to "Drain Pipes and
Fitting" .
Drain pipe or fitting 1. Vehicle vibration may 1 . Replace pipe or fitting. Refer
leaks. have loosened fitting or to "Drain Pipes and Fittings"
a pipe may have a hole later in this section.
rubbed in it from con-
tact with metal.
2. Broken pipe from
2. Replace pipe or fittings .
freezing.