7-13
GRT8100 SERVICE MANUAL POWER TRAIN
Published 3/26/2018, Control # 596-05
Exhaust System
Tier 3 Exhaust System
The Tier 3 exhaust system (Figure 7-13) is made of a muffler
and various tubes, elbows, and clamps.
When removing and installing a muffler, tighten all hardware
to specifications found under Fasteners and Torque Values,
page 1-15, unless specified otherwise:
• Tighten V-band clamps to 13.5±1.5 Nm (9.96±1.10 ft-lb).
• Tighten slip joint to 9 to 11.3 Nm (85 to 100 ft-lb).
• Tighten mounting bands to 5.4 Nm (4.0 ft-lb).
Tier 4 Exhaust System
The Tier 4 exhaust system (Figure 7-14) is made of a diesel
oxidation catalyst (DOC), decomposition reactor tube, a
selective catalytic reduction (SCR) unit and various tubes,
elbows and clamps.
Removal
1. Remove the sheet metal guard to gain access to the
exhaust system.
2. Remove clamp to free exhaust tailpipe.
3. Tag and disconnect electrical connections.
4. Disconnect the DEF hose.
5. Remove V-band clamp to free SCR from exhaust elbow.
6. Remove V-band clamps to free decomp reactor tube
from the elbows.
7. Remove V-band clamps to free DOC from the elbow and
tube.
8. Remove V-band clamps to free flexible exhaust hose
from the tubes.
9. Remove remaining tubes as necessary.
10. Inspect SCR, decomp reactor tube, DOC, exhaust
tailpipe, exhaust tubes, bracket, and attaching
hardware. Repair or replace any of these parts if
damaged or missing.
Installation
NOTE: Tighten all hardware to specifications found under
Fasteners and Torque Values, page 1-15, unless
specified otherwise.
Tighten V-band clamps to 13.5±1.5 Nm
(9.96±1.10 ft-lb).
Tighten slip joint to 9 to 11.3 Nm (85 to 100 ft-lb).
Tighten mounting bands to 5.4 Nm (4.0 ft-lb).
1. Secure the DOC to the exhaust tube and elbow with
V-band clamps.
2. Install the decomp reactor tube and secure with the
V-band clamps.
3. Install the SCR and secure with the V-band clamps.
4. Secure exhaust components to their mounting brackets.
5. Connect electrical connections as tagged during
disassembly.
6. Connect DEF hose.
7. Install sheet metal guard.
Slip Joint Exhaust Connectors - Tier 3 and 4
Slip joint exhaust couplers require tightening to avoid
exhaust leaks. Perform the following procedures at the
appropriate intervals.
After 1000 Hours, or One Year
Visually inspect the exhaust connector. If necessary, tighten
the V-band clamps by one full turn of the nuts.
2000 Hours or 2 Years
Tighten the V-band clamps by 1 ½ turns of the nuts.
4000 Hours or 4 Years
Tighten the V-band clamps by 1 ½ turns of the nuts.
5000 Hours or 5 Years
Remove the V-band clamps and gaskets, and replace them
with new gaskets and clamps. Tighten the V-band clamps to
13.5±1.5 Nm (9.96±1.10 ft-lb) of torque.
CAUTION
Burn Hazard!
Do not touch exhaust parts until they are at ambient
temperature. Severe burning may result.
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