Pto Brake Spring Adjustment; Cleaning; Clean Engine And Exhaust System Area; Remove Engine Shrouds And Clean Cooling Fins - Exmark NAVIGATOR NV640KC Operator's Manual

Figure 23
1. Loosen door hinge
nuts-three per side
PTO Brake Spring
Adjustment
PTO brake spring adjustment is only necessary if the
blower has been removed or replaced or if the PTO
drive idler arm has been disassembled.
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Locate the brake spring and thread the two jam
nuts out to the end of the brake spring rod (see
Figure 24).
3. Tighten jam nuts together at end of brake spring
rod.
Figure 24
1. Tighten jam nuts here
2. PTO Brake spring assembly
2. Place a piece of 3/8 inch
(9.5 mm) rubber on this
surface

Cleaning

Clean Engine and Exhaust
System Area
Service Interval: Before each use or daily
CAUTION
Excessive debris around the engine cooling
air intake and inside of the pump drive belt
compartment and damaged or missing rubber
baffles can cause the engine and hydraulic
system to overheat which can create a fire hazard.
Clean all debris from inside of pump drive belt
compartment daily.
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Clean all debris from rotating engine air intake
screen and from around engine shrouding and
exhaust system area.
3. Clean all debris from around engine, drive belts,
and exhaust system area.
Remove Engine Shrouds and
Clean Cooling Fins
Service Interval: Every 80 hours
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Remove cooling shroud clean-out covers from
engine and clean cooling fins. Also clean dust,
dirt, and oil from external surfaces of engine,
which can cause improper cooling.
3. Make sure cooling shroud clean-out covers are
reinstalled. Operating the engine without cooling
shroud clean-out covers will cause engine damage
due to overheating.
4. For 27HP Kohler units: Swing out the fuel tank
and remove debris from around the oil cooler
positioned at right front corner of engine.
Important: Do Not use water to clean engine.
Use low pressure compressed air. See Engine
Owner's Manual.
37
Maintenance
(May be required more
often in dry or dirty
conditions.)