Hustler Turf 3500, 3700 owner manual To drain the cooling system, Fan belt

WARNING: Allow the engine and radiator to cool before draining and flushing the system.

To drain the cooling system:

1.Use a suitable receptacle to catch the used coolant. Remove the radiator cap and open the drain valve to drain the radiator and engine block. Figure 4-18

2.After the coolant has drained, place a water hose in the radiator filler neck and run water through the system. When water is flowing from the block drain valve, start the engine. When the water flowing from the drain valve, is free of discoloration and sediment, stop the engine and remove the hose. Allow all water to drain from the system through the drain valve.

3.Close the drain valve and slowly refill the system with a 50/50 solution of permanent antifreeze and clear water. Fill until the coolant level is approximately 1.5”- 2.0” (3.8cm-5cm) below the bottom of the filler neck. Do not fill beyond this level.

4.Clean the radiator cap and cap seal and install the cap. Figure 4-19

5.Fill the coolant recovery reservoir bringing the fluid level up until it is between the full and low marks on the reservoir.

6.Open the front screen and remove chaff, dust, or other foreign substances. The foreign substances can be dropped onto the ground through the rubber at the lower part. Figure 4-20

7.Pull out on the radiator screen and clean it. Figure 4-17

8.Run the engine until normal operating temperature is reached, then stop the engine. Recheck the coolant level when the engine is cold and add additional coolant as necessary.

IMPORTANT: Never run the engine when the cooling system is empty. Do not add cold water or cold antifreeze solution if the engine is hot.

Drain valve

Figure 4-18

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 20-25 lbs. (9-11 kg) of thumb pressure is applied

Radiator

Figure 4-19

Radiator screen

open position

Figure 4-20

midway between the water pump pulley and the alternator pulley, a correctly tightened belt will deflect .40”-.60” (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 alternator mounting bolts with the engine running.

2.Pry the alternator away from the engine and tighten the mounting bolts.

3.Recheck belt deflection.

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