Oil Pump; Liquid Cooling System; Radiator - Arctic Cat 300 Utility Service Manual

Oil Pump


NOTE: Whenever internal engine components wear
excessively or break and whenever oil is contami-
nated, the oil pump should be disassembled,
cleaned, and inspected.

NOTE: The oil pump is not a serviceable compo-
nent. If the pump is defective, the oil pump must be
replaced.
REMOVING/DISASSEMBLING
1. Remove the oil pump from the engine (see Right-
Side Components in Engine/Transmission).
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

NOTE: If any part is worn excessively, cracked, or
damaged in any way, the oil pump must be replaced.
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 with the Phillips-head screw coated
with red Loctite #271.
4. Install the oil pump into the engine (see Right-Side
Components in Engine/Transmission).

Liquid Cooling System

When filling the cooling system, use pre-mixed Arctic
Cat Antifreeze. While the cooling system is being filled,
air pockets may develop; therefore, run the engine for
five minutes after the initial fill, shut the engine off, and
fill the coolant overflow tank under the seat to the FULL
line.
CAUTION
After operating the ATV for the initial 5-10 minutes, stop
the engine, allow the engine to cool down, and check
the coolant level. Add coolant as necessary.

Radiator

REMOVING
1. Drain the coolant at the engine.
2. On the Utility, remove the front rack; then remove
the front cover and fender assembly (see Steering/
Frame/Controls - Body).
3. Remove the upper and lower coolant hoses.
4. Remove the cap screws and nuts securing the radia-
tor to the frame.
5. Disconnect the fan wiring from the main wiring har-
ness; then remove the radiator/fan assembly and
account for the grommets and collars.
6. Remove the fan/fan shroud assembly from the radiator.
CLEANING AND INSPECTING
1. Flush the radiator with water to remove any contami-
nants.
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.
INSTALLING
1. Position the fan/fan shroud assembly on the radiator;
then secure with existing hardware.
KM136A
KM314A
79