Changing The Engine Coolant - Toro Wheel Horse 523Dxi Operator's Manual

Maintenance

Changing the Engine Coolant

POTENTIAL HAZARD
Coolant is hot and pressurized.
WHAT CAN HAPPEN
Discharge of hot pressurized coolant can
cause severe burns.
HOW TO AVOID THE HAZARD
Do not remove the radiator cap when the
engine is hot. Always allow the engine to
cool at least 15 minutes or until the
radiator cap is cool enough to touch
without burning your hand before
removing the radiator cap.
1. Park the machine on a level surface, disengage
the power take off (PTO), set the parking brake,
lower the attachment lift, and turn the ignition
key to "STOP" to stop the engine. Remove the
ignition key.
2. Remove the radiator cap and reserve tank cap
(Fig. 30).
1
Figure 30
1. Radiator cap
Note: If you wish, you can attach a 3/8 ID
hose to each of the two drain valves.
34
2
m–3765
2. Reserve tank cap
3. Open both coolant drain valves at the bottom of
the radiator and allow coolant to flow into a
drain pan. When coolant stops flowing, close
the drain valves and dispose of the coolant
properly.
4. Slowly fill the radiator with a 50/50 mixture of
water and permanent ethylene glycol anti–freeze.
Fill the radiator completely. Install the radiator
cap.
5. Slowly fill the reserve tank until the level
reaches the upper line. DO NOT OVERFILL.
Install the reserve tank cap.
6. Start the engine. To properly bleed air from the
coolant system, park the tractor on a slope with
the rear wheels approximately 6 inches
(152 mm) higher than the front wheels. Set the
parking brake. Run the engine until it is warm.
7. Park the tractor on a level surface and recheck
the coolant level in the reserve tank after the
engine has cooled down. Replenish the coolant,
if required; refer to Check the Cooling System,
page 15.