5
SECTION 55 -- ELECTRICAL SYSTEM -- CHAPTER 4
603.54.471.00 -- 11 -- 2004
-- hold the belt tensioner arm (2) and move it on
the bracket to reach the correct belt tension,
then tighten the securing nuts (3) to 55 Nm
(40.5659ft lb).
Correct deflection values, measured by applying the
following loads to the middle of the belt:
Version with-
out cab or
with cab with-
out air condi-
tioning
Version with
cab and air
conditioning
Load (N) (lb) 78 -- 98
(17.20--21.61)
60 -- 75
(13.28--16.53)
Deflection
(mm) (in.)
10--11
0.3937--0.4331)
10
(0.3937)
3. CHECKING THE W ARNING LIGHT
T urn the ignition key and check the light is completely
lit.
If the warning light does not light completely, check
the light bulb. If the light bulb has not blown, carry out
the alternator wiring connection tests as described in
the paragraph “PRELIMINARY TESTS” in this
section.
If the light is on, start the engine and run it above
minimum speed. The warning light should go out.
If the warning light does not go out, stop the engine
and disconnect the D+ terminal wire. If the warning
light goes out now , one of the alternator components
is malfunctioning. Carry out “ALTERNATOR COM-
PONENT TESTS” described in this section.
If the warning light stays on, check there is no short
circuit between D+ wire ending and warning light.
PRELIMINARY TESTS
These preliminary tests can be carried out without
removing any components from the tractor charging
circuit. These tests check:
• the alternator wire connections
• alternator charging current and controlled
voltage
• voltage drop in the alternator charging circuit
• maximum alternator output
The following testing devices are required:
• 0--30V moving coil voltmeter
• 0--1V millivoltmeter
• 0--110 A moving coil ammeter
• 1.5 ohm, 110 A varying load resistance
NOTE: Most testing devices on the market today
combine several electrical test functions
(multimeters). When using these devices, follow the
manufacturer’s instructions.
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