JLG G12-55A Service Manual - Manual (Page 108)

Engine
7-10 G10-55A, G12-55A
12. Loosen and remove the hoses (7) attached to the
transmission cooler. Plug and/or cap the hoses to
prevent dirt and debris from entering the
transmission system. Position the hoses out of the
way to allow radiator removal, or remove the hoses
from the engine. Inspect the hoses, and replace if
necessary.
13. Remove the radiator fan guard.
14. Remove the nuts and washers the radiator fan
shroud and pull the shroud back over the fan.
15. Remove the nuts and washers from the radiator and
oil cooler mounts.
16. Carefully lift the radiator and oil cooler out of the
engine compartment.
Note: If more clearance is needed to remove the
radiator, the engine fan may be removed for easier
access.
b. Radiator/Oil Cooler Installation
1. Install the isolator mounts to the bottom of the
radiator and oil cooler. Place the radiator and oil
cooler in the engine compartment at their original
orientations. Secure with the previously used
hardware.
Note: Be sure there is adequate clearance between the
radiator and the engine fan.
2. If necessary, install the engine fan.
3. Install the radiator fan shroud.
4. Uncap and connect the previously labeled hoses to
the radiator, oil cooler and/or transmission cooler.
5. Connect both intercooler hoses.
6. Install the coolant recovery tank. Uncap and connect
the previously removed hose.
7. Open the radiator cap and fill the radiator completely
with coolant. Replace and tighten the radiator cap.
Refer to Section 2.4, “Fluid and Lubricant
Capacities,” for proper capacities.
8. Properly connect the battery.
9. Run the engine to operating temperature. Visually
check for leaks with the engine running. Check the
coolant level in the overflow bottle and fill, or drain,
as necessary.
10. Close and secure the engine cover.
11. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
7.5 ENGINE ELECTRICAL SYSTEM
The engine electrical system, including the starter,
alternator and primary wiring, is described in Section 9.5,
“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: 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.
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.
7.6.2 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.