Dismantling The Servo Block; Servo Block Inspection/Repair; Assembling The Servo Block - Hatz 2-4L30 Workshop Manual

Dismantling the servo block:

– Take off lock washer (164/7)
– Hold piston (164/8), raise shaft (164/9)
and take out sickle-shaped lever
(164/10).
– Release piston (164/8) carefully and
take it out of the housing.
– Drive out locking collet (164/11) and pull
shaft (164/9) out of the housing.
– Take out grub screw (164/12).
– Remove circlip (164/13) and take out
washer (164/14) and eccentric disc
(164/15).
Inspection / repair:
– Examine piston to wear score marks.
– Renew gaskets.

Assembling the servo block:

– Assemble in the reverse order of work
for removal.
When installing the piston, use bushing
- 34 -.
Note correct position of gasket (164/6)
(oil hole).
Apply sealant D to machine screws
(164/3) and tighten them to a torque of
6.5 Nm.
Attention:
If the tightening torque is too high, the
servo piston may seize (distortion).
Assembling:
– Set the speed control lever to „Stop".
Make sure that the gasket is installed in
the correct position (oil hole) and that
the scriber markings are aligned.
Insert machine screws (164/2) using
sealant D and noting their correct posi-
tions; attach a lead seal.
167
Attention!
The sickle-shaped lever must never be
under or to the right of the stop.
– Screw the block on tightly.
– Set the speed control to the „Start" po-
sition and move piston (167/8) back and
forth between the start and stop posi-
tions. With the injection pump removed
or the side cover taken off, the governor
lever can be seen to perform the same
movement.
3
L / M . . 09.96