Every 250 Hours Or 6 Months - Alternator Drive Belt; Maintenance Of Cooling System; Fan Belts Maintenance - Perkins 400 Series User Handbook Manual

MAINTENANCE SCHEDULE & CHECKLISTS
EVERY 250 HOURS OR EVERY 6
MONTHS
ALTERNATOR DRIVE BELT
WARNING
OTHER MEANS OF STARTING THE
ENGINE.
Remove the small mesh guard around the
alternator. The toothed belt used to drive the
alternator relies on tooth engagement to
transmit load. It does not require pre-loading,
however a slight initial tension to ensure that
the belt fits snugly round the pulleys is
desirable. Using light pressure midway
between the two pulleys a total deflection of
1.5 mm (1/16") is satisfactory (see Fig. 31).
Refit the guard.
Key
(Fig. 31)
1 Pulley guard
2 Tensioning arm
3 Drive guard
4 Pivot bracket and bolt
MAINTENANCE OF COOLANT
COOLING SYSTEM
Check the specific gravity and the pH value
of the coolant (see
Workshop Manual). Visually check the
radiator core for
restriction.
43
DISCONNECT
BATTERIES OR ANY
page 25 of the
debris causing
1
Fig. 31
FAN BELTS
Fan belts should be checked for wear and
condition, particularly the following faults:
a Small cracks on 'V'-belt side and base.
Generally caused by lack of belt tension
but excessive heat and/or chemical
fumes can also give same failure.
b 'V'-belt swelling or softening.
Caused by excessive contamination by
oil, certain cutting fluids or rubber
solvent.
c Whipping during running.
Usually caused by incorrect tensioning,
principally on long centre drives. If a
slightly higher (or lower) tension does
not cure the problem, there may be a
critical vibration
system, which requires re-design or the
use of a banded belt.
air
2
frequency
4012/16 Diesel, February 1997
3
in the