Inspection Every 1000 Hrs. Or 4 Yrs - Yanmar 4LHA-HTP Operation Manual

5.2.4 Inspection Every 500 Hrs.or 2 yrs.
(1) Checking the Tension of the V-Belt of the Alternator
When there is not enough tension in the V-belt,
the belt will slip making it impossible for the
alternator to generate power.
Additionally, the fresh water pump will not work
causing the engine to overheat.
Check the tension of the V-belt in the following
manner.
©Press the V-belt down with your thumb at
the middle of the belt to check the tension.
The give in the V-belt should measure about
8 ~ 10mm at the depression.
©To adjust the V-belt tension, loosen the set
bolt and move the alternator.
©Replace the belt if it is damaged.
Parts No: 121850-42280
(2) Checking the Tension of the V-Belt
of the Power Steering Pump
When there is not enough tension in the V-belt,
the oil pump will not turn making steering
impossible and operation dangerous.
Check the tension of the V-belt in the following
manner.
©Press the V-belt down with your thumb at
the middle of the belt to check the tension.
T h e give in the V-be|t should measure about
8-10mm at the depression.
©To adjust the V-belt tension, loosen the set
bolt and move the oil pump.
©Replace the belt if it is damaged.

5.2.5 Inspection Every 1000 Hrs. or 4 yrs.

(1) Adjustment of Intake/Exhaust Valve clearance (2nd time & after)
This maintenance requires specialized knowledge. Consult your Yanmar dealer or distributor.
Adjustment is necessary to maintain the correct timing for the opening and closing of valves.
Neglecting adjustment will cause the engine to run noisily and result in reduced power output
and other damage.
(2) Inspecting and Adjusting Fuel Injection Valves (2nd time & after)
This maintenance requires specialized knowledge. Consult your Yanmar dealer or distributor.
Fuel injection must be adjusted to ensure optimal engine performance.
[NOTICE]
• If the V-belt tension is too tight, the
belt and the bearings of the alternator
will be damaged.
• Be careful not to spill any oil on the
V-belt as this will lead to stretching
and slippage.
Fresh cooling <
water pump
Crank pulley
For 4LHA-HTZP/-DTZP/-STZP
Power steering
oil pump
Parts No: 119175-25500
- 5 2 -
Set bolt
Alterator
Set bolt
8 — 1 0 m m
Tension:
o—i G mm