JLG G5-18A Service Manual - Manual (Page 86)

Engine
7-8 G5-18A, 2505H, 25.5
1. Have a dry chemical (Class B) fire extinguisher near
the work area.
2. Depending on which side of the tank is contaminated
(fuel or hydraulic oil), remove the fuel or oil tank
drain plug, and safely drain any fuel or hydraulic oil
into a suitable container. Dispose of fuel or hydraulic
oil properly.
3. Clean the fuel/hydraulic oil tank with a high-pressure
washer, or flush the tank with hot water for five
minutes and drain the water. Dispose of
contaminated water properly.
4. For the fuel tank side, add a diesel fuel emulsifying
agent to the tank. Refer to the manufacturer’s
instructions for the correct emulsifying agent-to-
water mixture ratio. Refill the tank with water, and
agitate the mixture for 10 minutes. Drain the 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.
c. Inspection
Note: If a leak is suspected between the fuel and hydraulic
oil tank, contact the local JLG dealer.
1. Inspect the fuel/hydraulic oil tank thoroughly for any
cracks, slices, leaks or other damage.
2. Plug all openings except one elbow fitting. Install the
elbow fitting, and apply approximately 1-1.5 psi
(0.07-0.10 bar) of air pressure through the elbow.
Check the tank for leaks by applying a soap solution
to the exterior and look for bubbles to appear at the
cracked or damaged area.
d. Disassembly and Assembly
The fuel/hydraulic oil reservoir is a one piece-unit integral
to the chassis frame and cannot be disassembled.
7.4.3 After Fuel System Service
1. Drain and flush the fuel tank if it was contaminated.
2. Fill the fuel tank with fresh, clean diesel fuel as required.
Note: If bleeding of the fuel system is required, contact
the local JLG dealer.
7.5 ENGINE EXHAUST SYSTEM
7.5.1 Exhaust System Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the travel select lever in the (N) NEUTRAL
position, engage the parking brake, and shut the
engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and steering wheel, stating that the machine
should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Properly disconnect the battery.
5. Loosen and remove the bolts (1) connecting the
muffler bracket to the frame brackets on the side of
the frame.
6. Loosen and remove the exhaust pipe flange nuts (2)
at the turbocharger.
7. Remove the exhaust system as an assembly.
M 8980 Y
ULS
LS
1
1
2
2