Service Manual

Multi Pro 5800−G Page 4 − 13 Kubota Gasoline Engine
CAUTION
The muffler and exhaust system may be hot. To
avoid possible burns, allow the engine and ex-
haust system to cool before working on the ex-
haust system.
Removal (Fig. 8)
1. Park machine on a level surface, stop engine, en-
gage parking brake and remove key from the ignition
switch.
2. Remove the rear undercarriage shroud from the ma-
chine (see Undercarriage Shrouds in Chapter 9 − Chas-
sis in this manual).
3. Disconnect rear oxygen sensor from machine wire
harness and remove tail pipe.
4. Remove catalytic muffler outer and inner heat
shields.
5. Disconnect catalytic muffler from header pipe and
machine frame and remove muffler.
6. Disconnect front oxygen sensor from machine wire
harness and remove header pipe.
7. Locate and discard exhaust system gaskets. Clean
gasket surfaces on engine exhaust manifold, catalytic
muffler and tail pipe.
8. Replace damaged or worn header pipe jackets or
shield if necessary.
Installation (Fig. 8)
NOTE: New oxygen sensor threads come pre−coated
with an anti seize compound. If a previously installed
oxygen sensor is used, apply a small amount of anti−
seize to the threads.
1. If installing an oxygen sensor, do not allow the tip of
the sensor to touch anything as it may become contami-
nated. Tighten from 29 to 44 ft−lb (40 to 60 N−m).
2. If header pipe was removed from engine, use a new
gasket and install header pipe and fasteners finger tight.
3. If catalyst muffler was removed, use a new gasket
and install muffler and fasteners finger tight.
4. If tail pipe was removed from engine, use a new gas-
ket and install pipe pipe, hanger and fasteners finger
tight.
5. Tighten exhaust system components in the following
order:
A. Tighten fasteners securing header pipe to ex-
haust header.
B. Tighten fasteners securing catalyst muffler to
header pipe and to machine frame.
C. Tighten fasteners securing tailpipe to catalyst
muffler.
D. Position the tailpipe so the outlet is parallel to the
ground and tighten exhaust system hanger and
bracket fasteners..
6. Install catalytic muffler inner and outer heat shields.
7. Install the rear undercarriage shroud to the machine
(see Undercarriage Shrouds in Chapter 9 − Chassis in
this manual).