JLG G5-18A Service Manual - Manual (Page 85)

7-7 G5-18A, 2505H, 25.5
Engine
28. Install and secure the battery cover.
29. Remove previously installed boom support.
30. Remove the Do Not Operate Tags from both the
ignition key and the steering wheel.
7.3 ENGINE ELECTRICAL SYSTEM
The engine electrical system, including the starter,
alternator and primary wiring, is described in Section 9,
“Electrical System.”
7.4 FUEL SYSTEM
7.4.1 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: Use only diesel fuel designed for diesel engines.
Some heating fuels contain harmful chemicals that can
seriously affect engine efficiency and performance.
Note: 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.
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.
If equipped for ULS, use 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.
If equipped for LS, use 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.
7.4.2 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 the local JLG dealer.
To clean the fuel/hydraulic oil tank: