Kohler LH630-775 Service Manual page 86

4. The drive belt is designed and constructed for
this system. Do not use a substitute belt. Check
the overall condition and replace the belt if
cracked, damaged, or proper tension cannot be
established by repositioning of the lower pulley
shims. Use only Kohler Part No. 66 203 02-S belt
if replacement is necessary.
See an authorized Kohler Service Dealer for any
necessary service.
Checking Fan Belt and Tension
The fan belt and belt tension should be checked daily
or before each use. The fan belt should not be cracked,
damaged, or exhibit excessive wear. Proper tension is
3/8" - 1/2" (12.7 mm) belt deflection per side under
10 lbs. applied tension. See Figure 7-10.
Figure 7-10. Checking Belt Tension.
If the belt is cracked, damaged, or is worn to the
extent that relocation of pulley shims cannot
establish proper belt tension, the belt should be
replaced. Use only Kohler Part No. 66 203 02-S belt.
DO NOT use a substitute belt.
For a new belt, assemble the lower pulley with all
three shims between the pulley halves. For a used/
original belt being reinstalled, assemble with two or
one shim(s) between the pulley halves and remaining
shim(s) on the outside (front) of the outer pulley half.
Check the belt tension as described above.
When proper tension is obtained, individually
remove, each capscrew of the lower pulley apply
Loctite ® No. 242 to the threads and reinstall. Torque
each of the four capscrews in a criss-cross sequence to
24.5 N·m (215 in. lb.). See Figure 7-11.
Figure 7-11. Torquing Lower Pulley Mounting
Screws.
Hoses and Tubes
Hoses and tubes are used to connect the components
within the cooling system. To guard against coolant
loss and hose failure, the hoses, tubes and their
connections should be checked regularly for leaks or
damage. Loss of coolant can result in serious engine
damage. Over time, engine vibration can affect hose/
joint connections, and the hoses themselves can be
affected by heat and the coolant. Swelling, hardening,
and/or deterioration can occur depending on the
operating environment. Deterioration usually takes
place more rapidly from the inside, making outside
inspections incomplete and not always dependable.
Regular outside inspection and careful inside
inspection whenever connections are opened, can
minimize a possible ''in-service'' problem.
Use new clamps whenever a hose is replaced or a
joint connection is opened. When making hose
connections, a light coating of rubber lubricant will
make assembly easier.
Thermostat Testing and Servicing
The thermostat is mounted in the intake manifold,
beneath the thermostat housing. See Figure 7-12. It
controls the rapid warm-up and operating
temperature of the engine. If a problem is encountered
which is thought to be the fault of the thermostat, it
can be checked to determine its operating condition.
Before removing and testing the thermostat, make
sure all other possible causes such as debris
accumulation/obstruction, leaks, belt or fan failure,
coolant level, and damaged components are
eliminated as possible causes.
Section 7
Cooling System
7.5
7