Farmi Forest Corporation VALBY HF 231, Operation, Maintenance And Spare Parts Manual

Page: 13 / 36

OPERATION AND MAINTENANCE
HF 231
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6. OPERATION
6.1. CONTROLS
HF231 is operated with an operating handle which
has three positions: FEEDING, STOP and
REVERSE. Fig.6.
REVERSE
STOP
FEEDING
Fig.6. Controls
6.2. OPERATION
1.Ensure that the feed chute is empty. Turn the
tractor hydraulics on.
2.Before feeding make sure that the tree is free
from stones, nails and other foreign objects.
3.If necessary adjust feedrollers rotation speed
to match the speed of the disc.
4.Pull the operating handle to FEEDING posi-
tion. Feedrollers start rolling when all air in
hydraulic circuit has been displaced.
5.Push the tree trunk inside the chute. Let go of
the tree as soon as the feedroller gets hold of
it.
Don’t work too close to the
feeding chute. The tree might
jerk up or to the right when it
comes into contact with the
teeth of the roller.
DANGER!
D When chipping large wood with a weak trac-
tor, can the tractor’s speed of rotation sink too
much. Interrupt the feeding by pushing the
control rod to STOP position. When the
speed of rotation has increased enough, con-
tinue feeding by pushing the rod to FEED
position.
D In case you must remove the tree from the
feed chute during chipping, push the rod to
REVERSE position and keep it there until the
feedrollers release the tree. The rod returns
itself to STOP position.
Oil is heating up when it flows
through the hydraulic motor.
Heating occurs especially if the
tractor has a very small hydrau-
lic oil reservoir. Check twice
every hour to prevent the oil
from overheating. Let the trac-
tor cool off if the motors are hot
CAUTION!
6.3. ADJUSTING THE FEEDING
SPEED
D Adjust feedrollers rotational speed to match
the speed of the disk with the oil control valve.
Turning counter--clockwise increases the
feedrollers speed. Fig.7.
Fig.7.
D Speed is suitable when the wood doesn’t
push against the flange of the disk, or the fee-
droller doesn’t noticeably slow the feeding of
the wood. See table below.
CHIP SIZE FEEDROLLERS
ROTATING SPEED
mm inch rpm rps
7 1/4” 18 0,30
15 5/8” 39 0,65
22 7/8” 57 0.95