Thermostat Removal And Installation; Water Pump Service - Toro Workman 3000 Series Service Manual

Thermostat Removal and Installation

1. Lower the coolant level to below the thermostat.
2. Loosen the hose clamp and disconnect the hose from
the water outlet fitting.
3. Remove the water outlet fitting and gasket (Fig. 38).
4. Replace the thermostat if necessary (See Thermostat
Test in the Testing section of this chapter).
5. Do not allow the thermostat flange to protrude from
the water outlet fitting joint. Do not place thermostat stay
in the direction of thermoswitch hole. Use a new gasket
when installing the water outlet fitting.
6. Check for damaged hoses or damaged hose clamps.
Replace as required. Install the hose on the water outlet
fitting and tighten the hose clamp.

Water Pump Service

1. Drain the cooling system.
2. Remove the drive belt from the water pump and
alternator.
3. Loosen the hose clamp and disconnect the hose from
the water pump.
4. Remove the water pump (Fig. 39).
5. Check the water pump for cracks or leaks. Rotate the
water pump shaft by hand. If the bearings do not rotate
smoothly, or are noisy replace the water pump with a
new water pump. There are no replaceable parts in the
water pump.
6. Install the water pump and a new gasket onto the
cylinder block.
7. Check for damaged hoses or damaged hose clamps.
Replace as required. Install the hoses on the water
pump and tighten the hose clamps.
8. Install the alternator / water pump drive belt and adjust
belt tension (see Belt Tension Adjustment).
9. Fill the cooling system with a 50/50 solution of clean,
soft water and ethylene glycol antifreeze.
Workman 3300-D/4300-D
7. Fill the cooling system to the proper level with a 50/50
solution of clean, soft water and ethylene glycol anti­
freeze (See Checking the Cooling System and Chang­
ing Coolant in the Maintenance section of this book.).
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Figure 38
Figure 39
1. Water pump
2. Gasket
Liquid Cooled Diesel Engine