PRONAR ZEFIR 85, Servicing Instruction

Page: 54 / 88

PRONAR
E. WORKING WITH THE TRACTOR
PRONAR
44
CHANGING WHEEL TRACK OF THE FRONT AND REAR DRIVING AXLE
Front and back driving axle of the tractor
ZEFIR provides possibility of changing the wheel track
depending on the way of placement of wheel disk and wheel band and by changing wheels one to another
(left wheel into right side and right wheel into left side) as well as changing tyres.
Depending on tyre size and the way of placement of wheel disk and wheel band, the tractor is
equipped with, there are two possible ranges of wheel track:
Front wheels: 1650-2000mm
Rear wheels: 1500-2100mm
Possibility of arranging wheel disk in
relation to wheel band is shown in the
Fig.
E-22 :
A (A’), C (C’) – internal fixing;
B (B’), D (D’) – external fixing;
C, D – shifting wheels;
A’, B’, C’, D’ – disk revolution
Fig. E-22 Way of fixing wheel band in relation to wheel disk.
When changing wheel track in case of necessity of having them shifted, one must dismantle the
wheel and make a half-turn and mount from the other side of the tractor. The arrow-head placed on the tyre
ought to correspond with driving direction forward of the tractor. Tread protrusion of the tyre are positioned
properly and the tyre (wheel and tractor) can provide maximum towing power at particular conditions.
Wheels of the tractor are very heavy. Handling with tractor wheels needs special
attention, when taking dismantling action you must secure them against falling down on
you, beacuse you may get hurt.
Dismantling rear tractor wheel, due to high risk of injury, requires two man in case the
operator does not have devices lowering effort (winch, traveller, fork lift truck, etc.).
After having wheels shifted, you must tighten screws fixing wheel disks to the wheel hubs, by applying force:
- front wheels: 280 Nm
- rear wheels: 280 Nm
and screws fixing wheel disks to the wheel band, applying force of 230
±
20 Nm
Never drive with the tractor with wheel band of wheel disk loosened. Always tighten nuts
by applying recommended force in recommended period of time.
ATTENTION ! After changing wheel track, it is necessary to set the toe-in, that should amount to 0
÷
5 mm for wheels of the front driving axle.