JLG 266 LoPro Service Manual - Manual (Page 66)

Engine: Deutz BF 4M 2012
7.6 266, 307, 266 LoPro
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 Non-Return Fuel Valve
If engine performance is suffering or if fuel injection
pumps and fuel injectors are wearing prematurely, the
Non-Return Fuel Valve may need to be replaced.
Note: On machines before S/N 1160003624, the non-
return fuel valve is not installed by the manufacturer. The
fuel valve will need to be installed.
1. Park the machine on a firm, level surface, fully
retract the boom, lower the boom, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Thoroughly clean the engine and surrounding area,
including all hoses and fittings before proceeding.
5. Disconnect the battery negative (-) cable from the
battery negative (-) terminal.
6. If the valve is installed: Locate the fuel return line (2)
coming from the fuel filter. Remove the hose clamps
securing the valve (3) in the fuel line.
If the valve needs to be installed: Locate the fuel
return line (2) from the fuel filter, cut the fuel line to
allow for valve (3) installation.
7. Install a new filter into the fuel return line being sure
the arrow on the valve is pointing away from the filter.
8. Secure the valve in place with two hose clamps.
9. Connect the battery negative (-) cable to the battery
negative (-) terminal.
10. Start the engine to check for proper operation.
11. Close and secure the engine cover.
7.6.3 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.
MZ2560
2
3