JLG G12-55A Service Manual - Manual (Page 113)

7-15 G10-55A, G12-55A
Engine
14. Remove the exhaust pipe from the exhaust
manifold. Refer to Section 7.7.1, “Exhaust System
Removal.”
15. Loosen the clamps on the sleeve reducer at the
engine and on the air suction pipe.
16. Remove the air cleaner tube assembly. Refer to
Section 7.8.1, “Air Cleaner Assembly Removal (John
Deere & Perkins),” or Section 7.8.3, “Air Cleaner
Assembly Removal (Cummins).”
17. Remove the access plug from bottom of the engine
bell housing. This will allow access to remove the
bolts holding the torque convertor diaphragm to the
engine flywheel.
18. Turn the engine over slowly by hand and align each
of the four torque convertor diaphragm bolts to be
accessed. Remove them one at a time.
19. Secure the engine with a lifting strap or chain from
the appropriate lifting points (1). Use a suitable hoist
or overhead crane.
20. Place a support or jack under the transmission to
hold the transmission in place while engine is being
removed.
21. Remove the bolts and washer securing the engine
mounts.
22. Remove the ten bolts holding the transmission to the
engine. Slightly lift and pull the engine out of the
machine. Have an assistant ensure that the engine
clears all frame components during removal.
23. Place engine on a flat, level surface.
7.9.2 Engine Installation
1. Secure the engine with a lifting strap or chain from
the appropriate lifting points (1). Use a suitable hoist
or overhead crane.
Note: Apply Loctite ® 242 to the engine mount bracket
capscrew threads before installation.
2. Install two guide studs in the bell housing holes.
3. Lift the engine and slowly push and lower into the
engine bay. Have an assistant ensure that the
engine clears the frame, hose and harness
components during engine installation. Position
engine brackets over the front frame mounts.
4. Push the engine towards the transmission aligning
the guide studs and the torque convertor shaft with
the corresponding holes.
5. Push the engine against the transmission and install
eight of the ten bolts and washers. Remove both
guide studs and replace with the remaining two bolts
and washers. Torque bolts to 53-58 lb-ft (72-79 Nm).
6. Remove the support from under the transmission
and lower the engine the remainder of the way onto
the frame. Align the motor mount holes and install
the bolts. Apply Loctite
® 242 to the motor mount
bolts and torque to 125-140 lb-ft (169-190 Nm).
7. Turn the engine over slowly by hand and align each
of the four torque convertor diaphragm bolts through
the access plug in the bell housing. Install them one
at a time. DO NOT fully tighten until all of the
capscrews and locknuts are in place. Torque to
26-39 lb-ft (35-59 Nm). Replace access plug.
8. Install the exhaust pipe. Refer to Section 7.7.2,
“Exhaust System Installation.”
9. Install the complete air cleaner assembly. Refer to
Section 7.8.2, “Air Cleaner Assembly Installation
(John Deere & Perkins),” or Section 7.8.4, “Air
Cleaner Assembly Installation (Cummins).”
10. Connect the fuel inlet line to the fuel filter head.
11. Connect the fuel return line to the fuel filter head.
12. Install the Power Distribution bracket.
13. Connect all the previously labeled electrical wire
connections on the Power Distribution bracket.
14. Connect all the previously labeled electrical wire
connections on the engine.
15. Install both heater hoses to the engine and tighten
clamps (if equipped).
16. Install the complete radiator assembly. Refer to
Section 7.4.3, “Radiator/Oil Cooler and
Replacement.”
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