Yanmar 4LHA-HTP Operation Manual page 406

Chapter 3 Fuel Injection Equipment
9. Pump Reassembly, Adjustment and Inspection
Part No. 157829-3520
Part No. 157829-8620
(Shaft)
Fig. 16
Fig. 17
Part No. 157829-1100
Fig. 18
Part No. 157829-8620
Part No. 157829-3520
b) Negative torque control type
(1) Use " M S " measuring device (Part No.
157829-8620).
157829-1100)
measuring device (Part No. 157829-3520.)
Before measurement, the pin of the plun-
ger lift stroke measuring device (Part No.
157829-3520) must be replaced with the
pin of the " M S " measuring device (Part
No. 157829-8620.)
(2) Position the pump upright, loosen the nut
(107) (See Fig. 25) and remove
governor shaft (108).
Install the shaft of " M S " measuring device
(Part No. 157829-8620) in place of the
governor shaft.
Take care not to drop the washer (111) and
shim (110) (See Fig. 25), by holding the
flyweight.
For an injection pump installed with a Load
Timer, screw in the governor shaft so that
the distance from the end of the governor
shaft to the pump housing flange surface is
3 mm. After adjustment, tighten the lock-
nut to the specified torque.
(3) Install the block gauge (Part No. 157829-
1100) as shown in Fig. 18. Insert the pin of
the plunger lift stroke measuring device
(Part No. 157829-3520) into the measuring
device shaft, already fixed in step b-(2).
Secure the dial using the nut. To set the
dial's zero point, slightly push the dial so
that the dial reads between 2 to 3 mm (the
tip of the pin touches the rear side of the
closing plug.) Ensure the governor sleeve is
pushed toward, the flyweight side.
Hold the corrector lever against the block
gauge, and push the tension lever against
the stopper pin, press-fitted into the pump
housing. Next, push the sleeve until the
start lever contacts the tension lever, and
will not move any further.
Next, read the dial and select the proper
sized closing plug, to ensure dimension
" M S " is as specified.
3-1-49
i 4LHA Series
block gauge (Part
and Plunger lift stroke
No.
the