HUSTLER 3700 Operator's Manual page 39

Figure 4-19
Radiator screen
open position
Figure 4-20
Fan belt
NOTE: Check the condition of the fan belt after every 50
hours of operation. Check fan belt tension after every 200 hours
of operation. Figure 4-21
A belt-driven fan located at the front of the engine draws air
through the fins of the radiator to lower the temperature of the
radiator coolant.
When 9-11 kg of thumb pressure is applied midway between
the water pump pulley and the alternator pulley, a correctly
tightened belt will deflect 10mm-15mm.
If the fan belt is slipping, fan efficiency is lowered, resulting
in the engine running too hot. If the belt is too tight, the life of
the alternator bearing will be shortened. If the fan belt shows
signs of cracking or fraying, install a new one.
To adjust fan belt tension:
1. Loosen the alternator mounting bolts. Figure 4-21
WARNING: Never attempt to loosen or tighten alter-
nator mounting bolts with the engine running.
2. Pry the alternator away from the engine and tighten the
mounting bolts.
3. Recheck belt deflection.
Alternator
adjusting
bolts
Figure 4-21
Transmission, front axle and hydraulic
109627CE_0512
Fan belt
4-11
system
IMPORTANT: Any maintenance operation that requires the
removal of safety covers must be performed by a trained service
technician.
WARNING: Hydraulic fluid escaping under pressure
may have sufficient force to penetrate skin and cause
serious injury. Foreign fluid injected into the skin must
be surgically removed within a few hours by a doctor,
familiar with this form of injury, or gangrene may
result.
Before applying pressure to hydraulic system, make
sure all connections are tight and all hoses and lines
are in good condition. To find a leak under pressure,
use a piece of cardboard or wood — never use your
hands. Relieve all pressure in the system before dis-
connecting or working on hydraulic lines. To relieve
pressure, lower all attachments and shut off engine.
Checking Oil Level:
Check the oil level every 50 hours.
1. With the power unit standing level and the engine off,
check the oil level with the dipstick. Figure 4-22
2. The oil is at the correct level when the oil level is within
the mark at the lower end of the dipstick. If low, add ISO
VG46 hydraulic oil, through the filler hole. Do not fill
beyond the mark on the stick, as the transmission will be
overfilled.
3. Install the dipstick.
Dipstick
Filler hole
Figure 4-22
Changing Oil & Filters:
NOTE: Replace the filters after the first 50 hours of opera-
tion and every 500 hours or annually thereafter following the
procedure below:
Change the oil every 500 hours or annually.
1. With the oil at normal operating temperature, drain and
discard the oil by removing the transmission drain plug.
Reinstall the plug after the oil has drained. Figure 4-23
REV F