SkyTrak 6036 Service Manual User Manual
Page 139
Section 8B
Cummins Engine
Model 6036/6036T S/N 9B0500 thru 14833
8B-19
a.
Fuel Filter Head Adapter Replacement
Preparatory Steps:
•
Clean debris
•
Remove fuel filters.
1.
Remove the retaining nut, filter head adapter
and sealing washers, Fig. 8B.41.
2.
Install in reverse order of removal. Torque
retaining nut to 24 lb-ft (32 Nm)
8B.11.6 How to Bleed the Fuel System
See paragraph 8B.6.2, How to Bleed the Fuel
System, for procedures to remove air from the fuel
system.
8B.11.7 Fuel Injectors
The Cummins engine uses Robert Bosch, 17 mm
closed nozzles, hole type injectors. However, the
injectors can have different part numbers for
different engine ratings. The last four digits of the
Cummins part number are used to identify the
injectors. The part number is located on the
bottom portion of the injector.
IMPORTANT: Use only the specified injector for
the engine.
During the injection cycle, high pressure from the
injection pump rises to the operating (pop) pres-
sure which causes the needle valve in the injector
to lift. Fuel is then injected into the cylinder. A
shimmed spring is used to force the needle valve
closed as the injection pressure drops below the
pop pressure to seal off the nozzle after injection.
MA1940
MA1520
Fig. 8B.41 Fuel Filter Head Adapter
Fig. 8B.40 Typical Fuel Lift Pump
8B.11.3 Fuel Level Sender and Gauge
The fuel level sender and gauge assembly is
described in Section 10, Electrical System.
8B.11.4 Fuel Lift Pump Testing
Inspect the camshaft lever and return spring for
excessive wear. To test the diaphragm, block the
fuel inlet line with your finger and operate the
priming lever. A good pump will have suction that
will not bleed down until you remove your finger
from the inlet, Fig.8B.40.
a.
Fuel Lift Pump Removal
1.
Clean debris from around the lift pump.
2.
Disconnect the fuel lines.
3.
Remove the capscrews, gasket, and fuel lift
pump.
b. Cleaning and Drying
Clean the exterior of pump with mineral spirits and
blow dry with compressed air.
NOTE: Parts replacement is not practical; the
pump is serviced as an assembly.
c.
Replacement
1.
Clean the mounting surface on the cylinder
block.
2.
Install the lift pump with new gasket, and
torque the capscrews to 18 lb-ft (24 Nm).
3.
Connect the fuel lines.
8B.11.5 Dual Head Fuel Filter
Replace fuel filter elements every 500 hours or six
months. Refer to paragraph 8B.6.1.