GENERAL
A. Purpose Of The Manual
This manual is expressly intended to pro-
vide qualified, trained diesel fuel injection
technicians the information necessary to
disassemble, reassemble and prepare to
test the Stanadyne DE electronic diesel fuel
injection pump. In addition to this manual
all special tools and test equipment as out-
lined herein are needed plus all service
pertinent literature, the individual pump
specification containing the calibration in-
formation and a parts breakdown.
This manual is not intended to be used by
untrained, inexperienced persons to at-
tempt to service the product. Such unau-
thorized service could result in violations
of emission regulations, pump damage or
possibly even engine damage. No service
should be performed on the DE pump be-
fore studying this manual and becoming
familiar with the principles and instructions
which follow.
B. Model Number System
The following information appears on the
DE pump nameplate.
1. Date Code – reference Service Bulle-
tin 439
2. Model Number – See description that
follows
3. Assembly Plant (J = Jacksonville, North
Carolina
4. Serial Number
5. Customer Part Number
The model number describes the DE pump
as follows:
a b c d e
DE 2 4 35 5780
a. DE = D series pump, E electronic
b. 2 = two pumping plungers
c. 4 = number of cylinders served
d. 35 = abbreviation of the pumping
plunger diameter. In this case - .350
inch
e. 5780 = specification number. Deter-
mines the selection of parts and adjust-
ments for a given application. Must be
included in any reference to the pump
C. General Information
The model DE pump is described as an
opposed plunger, rotary distributor, elec-
tronically controlled, spill solenoid type of
pump. When the spill-pump-spill control
strategy is employed by the equipment’s
Electronic Control Unit (ECU), the pump
can be described as a variable beginning
and ending of injection type.
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RE 507968
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