Specifications 3-4
DRIVE SYSTEM
NOTE: Use belt tension gauge TK P/N 204-427 whenever possible to check belt tension. However, on
some unit models, and on some belts, it is difficult to use the gauge. Adjust these belts to allow 12 mm
of deflection at the centre of the longest span. New belts should be tensioned cold and tensioned cold
again after 10 hours of unit operation.
Belt
Tension Number on TK Gauge
204-427
Field Reset
New TK Gauge 204-1903
Field Reset
SL: Direct Drive to Compressor (Model 30)
Electric Motor/Compressor Drive—Double
V Belt (Model 50)
80
37 Ampere, 12 Vdc Alternator 30
65 or 120 Ampere, 12 Vdc Alternator 45
Water Pump 35-40
Upper Fan (Fan to Jackshaft) 75
Lower Fan (Engine to Jackshaft) w/37
Ampere Alternator
80
Lower Fan (Engine to Jackshaft) w/65 or 120
Ampere Alternator
85
SLe and SPECTRUM SL**: Direct Drive to Compressor (Model 30)
Frequency
Electric Motor/Compressor Drive— 80–85
Upper Fan (Fan to Jackshaft) 85–90
Lower Fan (Engine to Jackshaft) w/37
Ampere Alternator
85–90
TK Gauge 204-1903
Tension Number on TK Gauge
204-427
Field Reset
New Belt
Frequency (Hz)
Field Reset
Frequency (Hz)
SLX/SLXe/SLXi and SLX/SLXe/SLXi
SPECTRUM **: Direct Drive to Compressor
(Model 30)
Electric Motor/Compressor Drive:
Units fitted with original SLX clutch
tensioner (up until build date 13th August
2013)
73-76 67-72
Units fitted with SLX clutch tensioner
retrofit (service P/N: 78-1884)
NB: use service tool (part number:
204-2436) to set belt tension.
Distance of 139.0mm as set by
service tool equates to 78-81 Hz
for a new belt, and 69-73 Hz for a
field reset belt
Units fitted with SLXe/SLXi clutch
tensioner (service P/N: 77-3189)
NB: use service tool (part number:
204-2436) to set belt tension.
Distance of 139.0mm as set by
service tool equates to 95 Hz for a
new belt
Fan Drive Belt (Model 50):
Fan Drive Belt 106-118 95-108
Water Pump 35-40
** SLe, SPECTRUM SL, SLX, SLXe, SLXi and SLX/SLXe/SLXi SPECTRUM units have one/two automatic tensioning
fan drive belt systems, in order to drive the compressor and the evaporator fanshaft. SLX/SLXe only has one, SL has two
(Upper and Lower).
The lower polygroove belt runs from the engine/compressor to the intermediate jackshaft (or electric motor, depending on
the unit model).
The upper polygroove belt links the intermediate jackshaft to the evaporator fanshaft, incorporating other belt driven
components such as the condenser blowers and the alternator.
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