JLG G12-55A Service Manual - Manual (Page 112)

Engine
7-8 G10-55A, G12-55A
7.4.2 Fuel Tank
Note: The fuel tank is a one piece unit. It is located on the
rear of the cab. If it is determined that the fuel tank must be
removed, the fuel must be drained before tank removal.
Always dispose of fuel properly.
a. Fuel Tank Removal
1. Park machine on a firm, level surface, level machine,
fully retract boom, lower boom, place transmission
control lever in (N) NEUTRAL position, engage
parking brake, and shut engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and steering wheel.
3. Open engine cover. Allow system fluids to cool.
4. Properly disconnect the batteries.
Note: If replacing tank, remove all internal and external
components from old tank, and retain for use on the
replacement tank.
Note: Have a dry chemical (Class B) fire extinguisher
near work area.
5. Remove the fuel tank drain plug (1), and drain fuel
into an approved and suitable container. Dispose of
fuel properly.
6. Label, disconnect and cap the supply fuel line (2)
from the bottom of the fuel tank.
7. Label, disconnect and cap the return fuel line (3)
from the bottom of the fuel tank.
8. Disconnect the fuel gauge harness (4).
9. Remove screws securing fuel sender (5) to the tank.
Remove fuel sender from tank.
10. Remove bolts on the fuel tank hold down bar (6).
11. Lift the empty fuel tank from the rear of the cab.
b. Disassembly
The fuel tank is a one-piece unit and cannot be
disassembled. The fuel level indicator can be removed and
reused on the new replacement tank. Dispose of the old
tank according to local regulations concerning hazardous
materials disposal.
c. Cleaning and Drying
If contaminated fuel or foreign material is in the tank, the
tank can usually be cleaned.
Note: If a leak is suspected in the fuel tank, contact JLG
Service Department.
To clean the fuel tank:
1. Have a dry chemical (Class B) fire extinguisher near
the work area.
2. Remove the fuel or oil tank drain plug, and safely
drain any fuel into a suitable container. Dispose of
fuel properly.
3. Clean fuel tank with a high-pressure washer, or flush
tank with hot water for five minutes and drain water.
Dispose of contaminated water properly.
4. Add a diesel fuel emulsifying agent to the tank. Refer
to manufacturer’s instructions for correct emulsifying
agent-to-water mixture ratio. Refill tank with water,
and agitate mixture for 10 minutes. Drain tank
completely. Dispose of contaminated water properly.
5. Refill the fuel tank with water until it overflows.
Completely flush the tank with water. Empty the fuel
tank, and allow it to dry completely.
d. Assembly
The fuel level indicator can be removed and reused on the
new replacement tank. Dispose of the old tank according
to local regulations concerning hazardous materials
disposal regulations.
MY4230
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