ONL2-2 7/13
25
a. Check cleanliness of air fi lter.
b. Check valve clearances.
c. Clean and check injectors.
3. Any repair which involves disassembly of the injection
pump must be carried out by specially-trained
mechanics with the proper tools and test devices.
NOTE: All warranties on the engine become null and
void if the injection pump seals are broken by
unauthorized
persons.
DB4 AND DB2 INJECTION PUMPS – REMOVAL
All Stanadyne DB2 and DB4 injection pumps will
have a retained drive shaft (shaft stays in pump when
pump is removed from engine).
1. Clean the fuel injection pump, lines and area around
the pump with cleaning solvent or a steam cleaner.
IMPORTANT: Never steam clean or pour cold water
on a fuel injection pump while the pump is running
or while it is warm. Doing so may cause seizure of
internal rotating pump parts.
2. Disconnect shutoff cable and speed control link-
age or cold start switch, if equipped. Disconnect
electrical connection to shutoff solenoid or throttle
positioning solenoid. Tag electrical wires for correct
reassembly.
IMPORTANT: Always use a backup wrench when
loosening or tightening fuel lines at injection pump
so that discharge fi ttings are not altered which will
prevent internal pump damage.
3. Disconnect fuel return line
(Figure 21-A)
and fuel
supply line
(Figure 21-C)
.
Figure 21
Reproduced by permission of Deere & Company, c.2005. Deere & Company. All rights reserved.
RG5659
Servicing
4. Disconnect all fuel delivery (pressure) lines
(Figure 21-B)
from injection pump using a suitable 17
mm deep-well crowsfoot socket.
5. Remove injection pump drive gear cover. Remove
drive gear retaining nut and washer from end of
pump shaft.
Be careful not to let washer fall
inside timing gear cover.
NOTE: The injection pump drive gear fi ts snugly onto
a tapered drive shaft and indexed by a hollow pin or
Woodruff key installed in drive shaft.
6. Attach JDG670A Drive Gear Puller
(Figure 22-A)
to
injection pump drive gear as shown.
NOTE: Replace 6mm Grade 12.9 cap screws
(C)
as
needed.
7. Evenly tighten the two 6 mm, Grade 12.9 screws
(threaded in drive gear) and snugly tighten center
forcing screw
(Figure 22-B)
against end of pump shaft.
Figure 22
Reproduced by permission of Deere & Company, c.2005. Deere & Company. All rights reserved.
RG7757
8. Tighten center forcing screw until pump drive gear
is free from tapered shaft. Remove JDG670A puller
(Figure 22-A)
and screws from drive gear.
9. Check to make sure that timing marks on back side
of front plate
(Figure 23-A)
and injection pump fl ange
(Figure 23-B)
are present and properly aligned. This
assures that repaired or replacement pump can be
properly timed to engine when installed.
Figure 23
Reproduced by permission of Deere & Company, c.2005. Deere & Company. All rights reserved.
RG6293
