JLG 4017PS Service Manual - Manual (Page 123)

7-7 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Engine
7.5 ENGINE ELECTRICAL SYSTEM
The engine electrical system, including the starter,
alternator and primary wiring, is described in Section 9.8,
“Electrical System Schematics.”
7.6 FUEL SYSTEM
7.6.1 Diesel Fuel
Fuel represents a major portion of machine operating
costs and therefore must be used efficiently. ALWAYS
use a premium brand of high quality, clean diesel fuel.
Low cost, inferior fuel can lead to poor performance and
expensive engine repair.
Note: Due to precise tolerances of diesel injection
systems, keep fuel clean, and free of dirt and water. Dirt
and water in fuel system can cause severe damage to
both injection pump and injection nozzles. Use #2 diesel
fuel with a minimum Cetane rating of 40. #2 diesel fuel
gives 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.
Inform owner/operator of machine to use #2 diesel fuel,
unless ambient temperatures are below 0° C (32° F).
When temperatures are below 0° C (32° F), 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 ultra low sulfur content fuel with a cloud point
(temperature at which wax crystals form in diesel fuel) at
least 10° below lowest expected fuel temperature.
Viscosity of fuel must be kept above 1.3 centistrokes to
provide adequate fuel system lubrication.
7.6.2 Fuel Tank
Note: Fuel tank is a one piece unit. It is located on rear of
cab. If it is determined that fuel tank must be removed, 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 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.
Note: If replacing the tank, remove all internal and
external components from the old tank, and retain for
use on the replacement tank.
Note: Have a dry chemical (Class B) fire extinguisher
near the work area.
5. Remove lower fuel tank cover (1).
6. Remove hydraulic oil reservoir. Refer to Section
8.7.3, “Hydraulic Oil Reservoir Removal/Installation.”
7. Remove fuel tank drain plug, and drain fuel into
an approved and suitable container. Dispose of
fuel properly.
8. Label, disconnect and cap fuel lines of fuel tank.
Disconnect fuel sender.
9. Support fuel tank with a floor jack or suitable
supports. Remove bolts securing fuel tank
support (2) to cab.
10. Lower fuel tank and support bracket away from cab
being careful to minimize fluid spillage.
11. If replacing fuel tank, remove bolts and washers
securing support bracket to fuel tank.
MAM0320
1
2