Yanmar 4LHA-HTP User Manual

Chapter 3 Fuel Injection Equipment
4. Adjustment of Fuel Injection Pump and Governor
4LHA Serie
4-7 Adjustment of governor
4-7.1 Adjusting the fuel limit bolt
(1) Adjust the tightness of the fuel limit bolt to bring
the rack position to the specified value (Ri ) with
the governor control lever all the way down
towards the fuel increase position. Keep the pump
at rated rpm N,.
Full load position
N. N, N, N,
(2) Check maximum RPM at no load
Further increase rpm, and make sure that rack
position (Rj = R, — L) corresponding to maximum
rpm at no load is within specified value (N
2
).
No load max. RPM
(Pump RPM)
See separate service data
4-7.3 Adjusting idling
(1) Maintain the pump rpm at specif ied rpm (N3).
Control lever
Idling adjustment bolt
Pump (rpm)
f
(2) Measure fuel injection volume at rack position
(RJ.
(3) If the injection volume is at the specified value,
tighten the fuel limit bolt lock nut.
4-72 Adjusting RPM limit bolt
(1) Gradually loosen the governor control lever while
keeping the pump drive condition in the same
condition as when the fuel limit bolt was adjusted,
and adjust the tightness of the RPM limit bolt to
the point where the rack position just exceeds the
specified value (R,).
Idling rpm (Pump RPM)
See separate service data
(2) Measure the injection volume as you lower the
governor control lever to the idling position, and
adjust the position of the control lever with the
idling adjustment bolt to bring it to the specified
value.
Measuring stroke
Idling injection volume
See separate service data
Maximum speed
adjustment bolt
Control lever
4-7.4 Check the injection volume when starting
(1) Make sure the control rack moves smoothly as
you gradually reduce idling rpm.
(2) Next fix the governor control lever at full load
position with the pump at the specified rpm (NJ.
Make sure that the control rack is in the maximum
position.
Measure the injection volume and check to make
sure it is within the specified value.
For models with a fuel limit bolt for starting,
adjust to the specified injection volume with the
fuel limit bolt.
3-2-35

Yanmar 4LHA-HTP Specifications

General

Brand	Yanmar
Model	4LHA-HTP
Category	Engine
Language	English