Liquid Cooling System; Radiator - Toro 500 EFI Service Manual

2. Remove the Phillips-head screw on the back side of
the pump and separate the pump housing and cover.
Note the position of the inner and outer rotors and
alignment pin for assembly.
3. Remove oil pump components.
CLEANING AND INSPECTING
1. Clean all oil-pump components.
2. Inspect the rotors for scoring and gouges.
3. Inspect the alignment pin, driveshaft, and driven
sprocket for damage.
4. Inspect the pump housing and cover for cracks or
damage.
ASSEMBLING/INSTALLING
1. Place the rotors into the pump housing making sure
the alignment pin is in the groove of the rotor.
2. Place the cover onto the pump housing.
3. Secure the pump cover with the Phillips-head screw
coated with red Loctite #271. Tighten to 8 ft-lb.
4. Install the oil pump into the engine (see Right-Side
Components in the Engine/Transmission section).

Liquid Cooling System

When filling the cooling system, use a coolant/water
mixture which will satisfy the coldest anticipated weather
conditions of the area in accordance with the coolant
manufacturer's recommendations.

NOTE: Use a good quality, biodegradable glycol-
based, automotive-type antifreeze.
While the cooling system is being filled, air pockets may
develop; therefore, remove the bleed plug on the coolant
pipe at the front of the engine allowing trapped air to
escape.
122
When pure coolant (no air) flows from the bleed hole,
install the bleed plug, tighten securely, and then fill the
cooling system to the bottom of the stand pipe in the radi-
ator neck. After operating the vehicle for the initial 5-10
minutes, stop the engine, allow the engine to cool down,
and check the coolant level. Add coolant as necessary.
Never check the coolant level when the engine is hot or
the cooling system is under pressure.
REMOVING
1. Drain the coolant into a suitable container; then discon-
nect the cooling fan wire connector from the main har-
ness.
2. Remove the two shoulder bolts and nuts securing the
radiator to the frame; then disconnect the upper and
lower coolant hoses.
3. Lift the radiator assembly from the vehicle. Account for
two upper and two lower rubber mounting grommets.
CLEANING AND INSPECTING
1. Flush the radiator with water to remove any contami-
nants.
TC024A
2. Inspect the radiator for leaks and damage.
3. Inspect all hoses for cracks and deterioration.
4. Inspect all fasteners and grommets for damage or wear.
! WARNING

Radiator

PR183A
PR184A