JLG G5-18A Service Manual - Manual (Page 70)

Engine: Perkins 1104D-44T
7.6 G5-18A/2505
Inform the owner/operator of the machine to use #2
diesel fuel, unless ambient temperatures are below 32° F
(0° C). When temperatures are below 32° F (0° C), a
blend of #1 diesel and #2 diesel fuels (known as
“winterized” #2 diesel) may be used.
Note: #1 diesel fuel may be used, however, fuel
economy will be reduced.
Use a low-sulfur content fuel with a cloud point (the
temperature at which wax crystals form in diesel fuel) at
least 10° below the lowest expected fuel temperature.
The viscosity of the fuel must be kept above 1.3
centistrokes to provide adequate fuel system lubrication.
Note: When using diesel fuel with a sulfur content below
1.3 percent, the filter change interval must be reduced by
75 hours. The use of fuel with a sulfur content above
1.3 percent is not recommended.
7.6.2 Fuel/Hydraulic Oil Tank
a. Cleaning and Drying
If contaminated fuel, hydraulic oil or foreign material is in
the tank, the tank can usually be cleaned.
b. If a leak is suspected between the fuel and hydraulic oil
tank, contact your local JLG distributor.
To clean the fuel/hydraulic oil tank:
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 your local JLG distributor.
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 0.07-0.10 bar
(1-1.5 psi) 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.
7.6.3 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
your local Perkins Service Partner.
NOTICE
Due to the precise tolerances of diesel injection
systems, keep the fuel clean, and free of dirt and
water. Dirt and water in the fuel system can cause
severe damage to both the injection pump and the
injection nozzles. Use ASTM #2 diesel fuel with a
minimum Cetane rating of 40. #2 diesel fuel gives the
best economy and performance under most operating
conditions. Fuels with Cetane numbers higher than 40
may be needed in high altitudes or extremely low
ambient temperatures to help prevent misfiring and
excessive smoking.
WARNING
DO NOT mix gasoline or alcohol with diesel fuel. The
mixture can cause an explosion. Failure to follow the
safety practices could result in death or serious injury.