PERIODIC MAINTENANCE
5-30
TNV DI Service Manual
Periodic Maintenance Procedures
Figure 5-10
Check and Adjust Cooling Fan V-Belt
Check and adjust the cooling fan V-belt every 250
hours of operation after the initial 50 hour V-belt
maintenance. See Check and Adjust Cooling Fan
V-Belt on page 5-22.
Check and Adjust the Governor Lever and
Engine Speed Control
(This does not apply to the following
electronically controlled engines: 4TNV84T-
Z, 4TNV98-E, Z, and 4TNV98T-Z.)
The governor lever and engine speed control
(throttle lever, pedal, etc.) of the machine are
connected together by a throttle cable or rod. If the
cable becomes stretched, or the connections
loosen, the governor lever may not respond to
change of engine speed control position. This may
make operation of the machine unsafe. Check the
cable periodically and adjust if necessary.
NEVER force the throttle cable or pedal to move.
This may deform the governor lever or stretch the
cable and cause irregular operation of the engine
speed control.
Checking and adjusting the governor lever:
1. Check that the governor lever (Figure 5-11, (1))
makes uniform contact with the high idle
(Figure 5-11, (2)) and low idle
(Figure 5-11, (3)) speed limit screws when the
engine speed control is in the high idle speed or
low idle speed position.
Figure 5-11
2. If the governor lever does not make contact with
the high idle or low idle speed limit screw, adjust
the throttle cable.
3. In some engine speed control applications,
loosen the throttle cable lock nut
(Figure 5-11, (4)) and adjust the cable so the
governor lever makes proper contact with the
high / low idle speed limit screw.
FULL
LOW
0000085A
(1)
CAUTION
NEVER attempt to adjust the low or high
idle speed limit screw. This may impair
the safety and performance of the
machine and shorten its life. If the idle
speed limit screws require adjustment,
see your authorized Yanmar industrial
engine dealer or distributor.
0000017en
0000069A
(4)
(3)
(1)
(2)
TNV_DI_SM_A4.book 30 ページ ２００７年１２月６日 木曜日 午前９時２３分
