JLG 4017PS Service Manual - Manual (Page 125)

7-9 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Engine
7.7 ENGINE EXHAUST SYSTEM
Note: Emission Sensitive Exhaust. Assembly must be
replaced exactly as removed. Contact your local JLG
dealer before removing the muffler system.
7.7.1 Exhaust System Removal—ULS
1. Park machine on a firm, level surface, level machine,
fully retract boom, lower boom, place transmission
control lever in the (N) NEUTRAL position, engage
parking brake, and shut engine OFF.
2. Place a Do Not Operate Tag on both ignition key
switch and steering wheel.
3. Open engine cover. Allow system fluids to cool.
4. Properly disconnect battery.
5. Remove belly pans.
6. Loosen and remove tail pipe clamp (1) at muffler (2).
7. Loosen and remove two clamp (3 & 4) connecting
tail pipe to muffler.
8. Remove tail pipe (5) from muffler (2).
9. Loosen and remove exhaust pipe clamp (6 & 7).
10. At bottom of muffler, loosen both muffler hangars (8).
11. Remove cotter keys, pins (9) and carefully lower
muffler (2) from the machine.
Note: Remove exhaust pipe between muffler and back
pressure valve as an assembly.
12. Loosen and remove V-band clamp (10) securing
exhaust pipe (11) to back pressure valve.
13. Remove exhaust pipe assembly.
7.7.2 Exhaust System Installation—ULS
Note: Keep all clamps loosened until entire exhaust
system is in place.
1. Install muffler and secure with hangars, pins and
cotter keys. Do not tighten hangars.
2. Install exhaust pipe between muffler and back
pressure valve. Secure with new clamps (10). Do
Not Tighten.
3. Install pins and cotter pins (9) and carefully install
muffler (2) from machine.
4. Tighten and torque muffler hangars (8) to
47-63 Nm (35-63 lb-ft).
5. Tighten and torque V-band clamp (10) to 11-13 Nm
(8-9.5 lb-ft).
6. Tighten and torque ball clamp (7) to 33-37 Nm
(24-26.5 lb-ft).
7. Install tail pipe (5) to the muffler (2) with previously
used clamp (4). Do Not Tighten.
8. Install clamps (3 & 4). Do Not Tighten.
M 6321 Z
1
3
4
2
5
MZ6590
8
6
7
9
2
10
11