GMC 1976 ZEO 6083 Maintenance Manual page 829

HOLDING TANK
HOLDING TANK REMOVAL
1 . Drain holding tank completely and close drain
valve.
2 . Remove toilet assembly . Refer to the section
24K for removal procedures .
3 . Remove toilet mounting flange by removing
six flange to floor mounting screws . Unscrew flange
from holding tank .
4. Remove dump tube with fullway valve by
removing four screws holding valve to mounting
area on holding tank .
5 . Remove cotter pin from valve rod and remove
control rod (See figure 2) .
6. Remove two electrical leads from holding tank
sending unit.
7 . Remove the drain pipe access cover inside the
storage compartment below the Living Area Electri-
cal Compartment then use a basin wrench as shown
in Figure 3 to loosen pipe fitting from tank .
8.. Remove two retaining nuts from each of the
two mounting brackets (See figure 2).
9 . Holding tank can now be lowered to floor.
Figure 2-Holding Tank Mounting
HOLDING TANK AND DRAINAGE SYSTEM
24L- 3
HOLDING TANK REPAIR
Except for small, clean punctures the holding
tank is not repairable . Polypropylene plastic, used to
manufacture the tank, resists all common adhesives .
The contents of the tank will quickly corrode any
sheet metal, pop-rivets or screws used to plug or
patch the tank .
A small puncture may be repaired with a well
nut. Enlarge puncture hole with a drill and insert
well-nut . Tighten securely .
HOLDING TANK INSTALLATION
1 . Position holding tank and secure with two
mounting brackets . Install nuts and tighten with fin-
gers . Tighten pipe connector into tank, using a basin
wrench as shown in Figure 3. Install drain pipe cover
and secure with three screws . Torque holding tank
bracket nuts to 95-145 in . lbs.
Figure 3-Loosening Pipe Fitting