JLG 4017PS Service Manual - Manual (Page 129)

7-13 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Engine
7.9 ENGINE REPLACEMENT
7.9.1 Engine/Transmission Removal
Note: The radiator assembly must be removed from the
machine before engine/transmission removal. Refer to
Section 7.4.3, “Radiator Assembly Replacement.”
Several additional components must be removed before
engine/transmission removal. They will be addressed in
the following procedures.
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(s) and remove.
5. Properly drain hydraulic oil system. Refer to Section
8.7, “Hydraulic Reservoir,” for detailed instructions.
6. Properly drain transmission. Refer to Section 6.4.1,
“Transmission Removal,” for detailed instructions.
7. Mark position of cover to help with cover adjustment
when being reinstalled.
8. Remove hood (1), end cover (2) and belly pans from
engine compartment.
9. Remove the heater and cooling hoses attached to
the engine.
10. Label, disconnect and cap/plug all hydraulic
connections on the engine/transmission.
Note: Engine/transmission harness is routed and
attached to engine/transmission using hold-down clamps
and plastic wire ties at various places on engine. Before
removing engine/transmission, ensure that harness
has been completely separated (disconnected) from
engine/transmission. Move harness clear of engine/
transmission, and with help of an observer, ensure that
engine/transmission clears the harness during removal.
11. Label and disconnect all electrical wire connections
on engine/transmission.
12. Disconnect and cap the fuel inlet line (3).
13. Disconnect and cap the fuel return line (4).
14. Label and remove all clamps securing any fuel line
on engine.
15. Remove exhaust pipe from exhaust manifold. Refer
to Section 7.7, “Engine Exhaust System.”
Note: Emission Sensitive Exhaust. Assembly must be
replaced exactly as removed.
16. Remove air cleaner assembly. Refer to Section 7.8,
“Air Cleaner Assembly.”
17. Remove drive shaft assemblies.Refer to Section
5.10.3, “Drive Shaft Removal.”
18. Secure engine with a lifting strap or chain from
appropriate lifting points. Use a suitable hoist or
overhead crane
MZ6550
1
2
MZ6620
4 3