Masport UJ102, Руководство пользователя

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101
6.3.6 MOWING DECK - SHARPENING AND REPLACING BLADES
► SHARPENING THE BLADES
The mowing blades must be sharp, statically balanced and straight. Blunt, incorrectly sharpened or damaged mowing blades
cause grass to be torn out of the ground, damage to lawns and mediocre collection of mowed grass in the grass catcher.
Do not repair a blade that is deformed or otherwise damaged, replace it immediately.
Whenever handling the mowing blades, always use heavy-duty work gloves.
Sharpening procedure:
6.3.6a

Remove the grass catcher, tilt the machine on to the right side and prop it up using suitable supports. It is
recommended to invite another person to help with tilting the machine in order to prevent damaging a part of the
machine or an injury.

Unscrew both blades and clean them.

First sharpen with a grinder and then with a file.

On the 110 cm three-blade mowing deck each pair of blades is fastened using 3 bolts (blades are not equipped
with break pins). We recommend that you mark the blades before removing them to avoid problems when putting
them back.
Do not sharpen directly on the mowing deck.

After sharpening the blades, do not install them yet, but check their balance, see procedure below.

Prior to reinstalling the blades, check the condition of the break pins which serve as protection of the mowing deck.
If the break pins are damaged, replace them immediately. Spare pins are supplied with the machine.
6.3.6b

After checking the balance and the brake pins, screw the blades back in position. During installation, ensure that the bend of the
blades points upwards into the mowing deck body. Do not interchange the left and right blades. The right blade has a bolt with
a left thread.

Carefully tighten the fastening bolts using a torque wrench using the prescribed tightening torque of 30
±
3 Nm . This torque is
achieved the moment when the tangential (convex) spring under the fastening bolt is fully compressed and from this point on the
bolt is not tightened.
► BALANCING THE BLADES
Pay increased attention to levelling and balancing the blades. The vibration of blades that are not levelled and balanced may
damage the engine or the mowing deck.
When balancing, insert the screwdriver into the centring hole and set the blade into
a horizontal position. If the blade remains in this position, it is balanced. If one of the ends
is weighs down, grind this side until it is balanced. When balancing by grinding, do not
shorten the length of the blade! The permitted static imbalance may not exceed 2g.
If you are not certain about the procedure, please contact an authorised service centre, where they will gladly provide advice.
► REPLACING THE BLADES
If due to frequent use the blades are damaged, they cannot be balanced or sharpened properly, it is necessary to replace them.
Proceed as follows:

Remove the grass catcher, tilt the machine on to the right side and prop it up using suitable supports. It is recommended to invite
another person to help with tilting the machine in order to prevent damaging a part of the machine or an injury.

Screw out both blades.

Prior to installing new blades, check the condition of the brake pins which serve as protection of the mowing deck. If the break
pins are damaged, replace them immediately.

Check that the blades are balanced, see above.

Screw on the new blades. During installation, ensure that the bend of the blades points upwards into the mowing deck body. Do
not interchange the left and right blades. The right blade has a bolt with a left thread.

Carefully tighten the fastening bolts using a torque wrench using the prescribed tightening torque of 30
±
3 Nm . This torque is
achieved the moment when the tangential (convex) spring under the fastening bolt is fully compressed and from this point on the
bolt is not tightened.
When the blades impact a solid obstacle, immediately stop the engine and check the blades! The break pins may be
damaged or broken.
Whenever handling the mowing blades, always use heavy-duty work gloves.
Always only use blades recommended by the manufacturer or supplier of the riding mower. The use of blades and/or
fastening parts that are not recommended may result in improper mowing results, damage to the machine and in the
event that they come off during operation also injury to people.
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6.3.7 MOWING DECK - INSPECTION AND BALANCING
To achieve the best mowing results the mowing deck must be set at the correct mowing height and both sides of the deck must be
level.
Before carrying the adjustment:

Place the machine on an optimally even surface , inflate all the tyres to the prescribed pressure (80 -140 Kpa, ± 10 Kpa
difference between the individual tyres) and secure the entire machine against movement (e.g. using a suitable wedge, etc.).

Move the mowing deck elevation adjustment lever to position 1 .
The mowing deck is equipped with plastic covers which prevent hand access to moving parts and to the machine drive
parts of the machine.
The covers can be very quickly and easily removed using the quick coupling pins on the sides of the covers. Slide
a screwdriver into the pin groove and turn it anticlockwise. Then take the cover off the machine.
6.3.7

Distance A is the front edge of the mowing deck in the travel direction and it must be 23-25 mm above the ground.
Check it on both sides of the mowing deck. If the height is different, loosen the lock nuts (
2
) on the respective draw
rod ( 1 ) and adjust the height by the turning nuts ( 3 ). After setting the correct height, do not forget to tighten the lock
nuts ( 2 ).

Distance B is the rear edge of the mowing deck in the travel direction and it should be 28-30 mm above the
ground, i.e. the rear edge must be at least 5 mm higher than the front edge. If the height is different, adjust it by
loosening nuts ( 4 ), setting the edge to the correct height and tightening the nuts with a torque of 55 – 65 Nm .
If you are not certain about this procedure, have it performed by a service centre.
6.3.8 MOWING DECK - CHECKING AND ADJUSTING THE V-BELT
6.3.8
Because of the demands placed on it, the tension of the mowing deck drive belt ( 1 ) declines over time and it is
necessary to tension this belt. The belt is tensioned using bolts and a spring.

Set the mowing deck to position 1.

Using a suitable wrench, turn nut (
2
) so that spring (
3
) is tensioned to a value of
145
±
1 mm
.
6.3.9 MOWING DECK - ADJUSTING THE COGGED BLADE DRIVE BELT
6.3.9a

Lower the mowing deck to the lowest position by moving the elevation adjustment lever to position 1 .

Release the quick coupling pins of the mowing deck side covers and take the covers out.

Release the quick coupling pin ( 1 ) of the top cover ( 2 ) and approximately in its middle tilt the cover upwards
6.3.9b

Slide an appropriate spanner under the metal cover, from underneath place it on the belt pulley bolt ( 1 ). From
above loosen the belt pulley nut.

Loosen the lock nut (
2
) and nut (
3
). Then, using an appropriate wrench, turn nut (
3
) so that the cogged belt (
4
) is
properly tensioned.
6.3.9c

The belt is correctly tensioned when a force of 4 kP ( 40 N; 72 Hz ) acting on the middle distance between the belt
pulleys (
1
) and (
5
) results in the belt bending by approximately
0.5 cm
.
To measure force you can use a standard mechanical dynamometer available in stores selling such products.

Tighten the lock nut ( 2 ) of the tensioning mechanism and again tighten the nut of the cogged belt pulley ( 1 ).

Reattach the side and top cover and tighten them.
6.3.10 MOWING DECK - REMOVING IT FROM THE MACHINE
6.3.10a

Set the mowing deck to the highest position by moving the elevation adjustment lever to position 7.

Slightly lift up the grass ejection chute ( 1 ) and slide it off the two pins welded to the frame of the mowing deck.
Then either move the chute approx. 10 cm backwards and secure it in place, or completely take it out through the
rear plate.
6.3.10b

Using an appropriate wrench, turn nut ( 2 ) so that the tension on the spring ( 3 ) is completely released. Then remove
the belt ( 1 ) from the belt pulley of the electromagnetic engine transmission.
6.3.10c

Slide the spring pins ( 4 ) from both the rear mowing deck suspension shaft pins ( 5 ). Screw out the nut ( 6 ) from the
front shaft pin and pull out the shaft pin ( 7 ). Using pliers, slide out both pins ( 5 ). For the the mowing deck mulching
option, first remove the part of the mulching flap lever that extends above the floor of the machine.
6.3.10d

Slowly pull out the mowing deck to one side of the machine.