Yazoo/Kees ZMKW48172 - Manual (Page 39)

English - 39
MAINTENANCE
Hydraulic system
Check oil level in tank daily. Oil level should be ¾" to
1" below the top of the tank. Check all fittings, hoses
and lines for damage or leaks. Replace or repair any
questionable lines or fittings.
Change the oil and filter after the first 250 hours of
operation then annually after that. Drain tank and
remove filter, be sure to clean around the tank and filter
head before removal. Replace filter and drain plug and
refill hydraulic tank. Only use MOBIL 1 synthetic oil.
Raise and block up the rear of the machine so the drive
wheels can rotate freely. Start the engine at the lowest
RPM possible, move the motion control levers forward
and run machine for several minutes. Stop engine and
recheck the oil level.
If the wheels do not respond an air lock has occurred
within the system. The system must be bled off of air
or let the machine set overnight to allow the air time to
dissipate out of the oil. DO NOT run the machine with
an air lock serious damage can occur to the pumps
and wheel motors.
Mower blades
Inspect blades and sharpen or replace as needed.
Check blades daily or as needed. Bent, cracked or
blades with large notches in them should be replaced.
Sharpen to an angle of 22 to 28 degrees. Always check
the balance of the blades after sharpening to prevent
excessive vibration.
Checking the Blades
In order to attain the best mowing performance, it is
important that the blades are well sharpened and not
damaged.
Bent or cracked blades or blades with large nicks
should be replaced.
Check the blade mounts.
Damaged blades should be replaced after hitting
obstacles that result in a breakdown. Let the service
workshop decide whether the blade can be repaired/
ground or must be discarded.
Blade replacement
Remove blade bolt by turning counterclockwise.
Install new or resharpened blade with stamped
“GRASS SIDE” facing towards ground/grass (down) or
“THIS SIDE UP” facing deck and cutter housing.
Some blades may not be stamped with “GRASS SIDE”
and “THIS SIDE UP”. These blades can be installed
either way.
Install and tighten blade bolt securely. Torque blade
bolt to 90 ft/ lbs (122 Nm).
WARNING!
If a leak is suspected, use a piece of
cardboard or wood, NOT your hands, to
check for leaks.
Escaping hydraulic oil under pressure can
have sufficient force to penetrate the skin,
causing serious injury.
If injured by escaping fluid, see a doctor
at once. Serious infection or reaction can
develop if proper medical treatment is not
administered immediately.
WARNING!
Blades are sharp. protect your
hands with gloves and/or wrap
blades with a heavy cloth when
handling.
IMpORTANT INfORMATION
The sharpening of blades should be carried
out by an authorized service workshop.
IMpORTANT INfORMATION
Special blade bolts are heat treated. Replace
with a Yazoo/Kees bolt if required. Do not use
a lower grade hardware that specified.