Changing The Coolant; Checking And Adjusting The Engine Valve Clearance; Checking The Alternator And The Starter - Komatsu PC12R-8 Operation & Maintenance Manual

MAINTENANCE PLAN
4.7.11.b CHANGING THE COOLANT
DANGER
• Soon after the machine has been stopped the coolant is
very hot and under pressure and it may cause serious
burns; let the engine cool down until it reaches approxi-
mately 40÷45°C before changing the coolant.
• Slowly loosen the radiator cap, in order to release the re-
sidual pressure.
• Oils, filters, the coolant and the battery are considered
special waste and must be collected and disposed of ac-
cording to the anti-pollution regulations in force.
IMPORTANT
• The following operations refer to the change of permanent
coolants; if the coolant is water or water with antifreeze,
which is used according to the season, it is necessary to
wash the cooling circuit in order to eliminate any encrus-
tation. (See "4.7.1.a WASHING THE COOLING CIRCUIT").
1 - Open the engine hood (See "3.5.1 ENGINE HOOD").
2 - Loosen and remove the upper cap (1) of the radiator.
3 - Open the drain cock (2) of the radiator, remove the drain plug
(3) positioned on the engine block and let the fluid flow out.
Use a 17 mm hexagon spanner.
While the fluid flows out, drain the coolant tank (4).
4 - Close the drain cock (2), put back the plug (3) on the engine
block and fill the radiator with new fluid (See "4.3 FUEL,
COOLANT AND LUBRICANTS").
5 - Start the engine and let it idle for a few minutes; check the
level again and if necessary top up before putting back the
upper cap (1).
6 - Fill the tank (4) until reaching the maximum level.
4.7.11.c CHECKING AND ADJUSTING THE ENGINE VALVE CLEARANCE
Since the check and adjustment of the engine valve clearance require the use of special tools, have these oper-
ations carried out by your Komatsu Utility Dealer.
4.7.11.d CHECKING THE ALTERNATOR AND THE STARTER
For any inspection and/or repair, contact your Komatsu Utility Dealer.
If the engine is started frequently, have an inspection carried out every 1000 hours of operation.
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