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KD 477-2 Workshop Manual_cod. ED0053029370_
1° ed
_ rev.
00
XI
33
34
35
Fuel circuit
Feeding is carried out by a diaphram pump actuated by a camshaft
eccentric coupled to a cap.
See assembly on page 36 and consult spare parts catalogue for re-
placement.
Details of fig. 33:
1
.Tank -
2
.Diesel filter -
3
.Feeding pump -
4
.Injection pump -
5
.Injec-
tion pipes -
6
.Injectors -
7
.Diesel discharge pipe.
Injection pump
The injection pump is of the single casing type with two, constant
stroke, separate pumping elements. Details of fig. 34.
1
.Pump casing -
2
.Pumping element -
3
.Rack bar -
4
.Eccentric do-
wel -
5
.Adjusting bushing -
6
.Spring -
7
.Lower plate -
8
.Tappet -
9
.Up-
per plate -
10
.Locking pin -
11.13.18
.Gaskets -
12
.Diesel intake con-
nection -
14
.Diesel exhaust screw -
15
.Delivery valve -
16
.O-ring -
17
.Valve spring -
19
.Delivery connection.
Checking injection pump
Before dismantling injection pump check pressure seal of the pum-
ping unit, cylinder and valve as follows:
1
. Connect a pressure gauge graded up to
600 kg/cm²
(fig. 35) to
the diesel delivery pipe.
2
. Set the rack bar in a half way position.
3
. Rotate flywheel showly until the pumping element has completed
a compression stroke.
If the test is carried out on the bench, take care that the
pumping element does not strike the delivery valve while
pumping.
4
. Take the pressure gauge reading. If the reading is less than
300
kg/cm²
, the complete pumping unit must be replaced.
During the test, the reading on the gauge will show a progressive
pressure increase to a maximum value and will then fall suddenly
and stop at a lower pressure.
Replace valve if the fall in pressure exceeds
50 kg/cm²
and con-
tinues to fall slowly.
Injection pump setting
Register eccentric dowel to the maximum capacity of the pumping
elements (
q
, fig. 39).
INJECTION EQUIPMENT
