A 09.00 Speed Controls; A 09.60 Low Idle Speed Stabilization - Hatz Diesel 1D30 S Workshop Manual

A 09.00 Speed controls

A 09.60 Low idle speed stabilization

- 5 - 30 -
General:
Several engine applications require a very
precise speed governing also in the range of
low idle, for example engines with hydraulic
pumps in cold condition.
For this case the low idle speed stabilization
is available.
Function:
– The main governor spring is approx. 1 mm
shorter than the standard one so that it is
deactivated at engine speeds below
1000 rpm.
– Governor lever 1 is working over the full
speed range.
– The retainer spring 2 is connected to an
adjustable lever 3 and works as governor
spring at the speed range below 1000 rpm.
– The stabilization spring 4 is fitted to stabi-
lize the overreaction of the governor lever
when the speed control lever is turned
back into „low" position.
It can be adjusted by the eccentric disk 5.
– The standard stop screw 6 is turned back
a few threads to ensure it is out of function.
Basic adjustment:
– Turn screw II so that eccentric disc 5 is
facing towards timing cover.
Flat surface at outer end of screw II is now
parallel with timing cover.
– Turn screw III into a position that the
stabilization spring 4 is slightly tuching
the eccentric disc 5.
This is the final position.
Lock screw III by tightening the counter
nut.
– Turn screw II approx. 180° counter clock-
wise (Stabilization spring 4 now is forced
as far as possible towards crankcase).
2
1D . . / 03.06
– Turn screw I so that lever 3 is facing
vertical downwards (pin 7 is also in a
vertical position).
Fine tuning:
(with engine running)
– Connect rev. counter - 30 -
– Set low idle speed to approx. 600 rpm.
If engine speed drops too far and
engine stops, than turn screw I in direc-
tion „+" (counter clockwise).
If such low speed can not be obtained
turn screw I in direction „-" (clockwise)
or turn screw 6 back for some threads.
– Turn screw I slightly in counter clockwi-
se direction until the aspired speed is
reached and lock screw with counter nut.
– Turn screw II clockwise (use tool - 5 - )
until the stabilizing spring is just
touching the governor lever. This is indi-
cated by an additional rise of the
engine speed (max. 5 rpm).
Lock screw by tightening the counter nut.
– Finally seal all adjustment screws with
sealing wax.