MTZ 1220.1/1220.3
Section H. Adjustments
H17
PTO adjustments
Checking wear of PTO brake band linings
The external sign indicating the
degree of wear of PTO brake belt linings
and the need for adjustment operations is
the size A (Fig. H-11) between the upper
point of the rod head (2) and the cylinder
cover (1).
Check the sizes when the diesel engine is
running and the synchronous — neutral —
independent shifter is in its neutral
position. To do this, run the diesel engine,
first engaging the parking brake and
blocking the rear wheel with wedges in
front and behind. Check the oil pressure in
the PTO control system. It must be min.
1 MPa (10 kgs/cm2).
On an adjusted PTO, the size A must
be:
• 66 ± 3 mm (PTO engaged);
• 46 ± 3 mm (PTO disengaged).
If the size A > 80 mm (PTO engaged) and
A < 32 mm (PTO disengaged), as well as
if the PTO slips, adjust the band brake
clearance.
1 — cylinder, 2 — rod, 3 — lever.
Fig. H-12 — Checking wear of PTO brake band linings
Adjusting clearance in PTO belt brakes
Attention: Adjust the PTO belt
brake clearance only in a special
workshop.
Adjust the clearance in the PTO belt
brakes as follows:
- shift the lever (1) (Fig. H-12) to its
neutral position, aligning the holes in the
lever and the rear axle housing with an 8
mm rod or a M10×60 bolt (2);
- remove the cotter pin and remove the
locking plate (8); - screw the adjusting bolts
(6) to a torque of 8 to 10 N
·
m and then then
unscrew by two turns (access the bolts
through a hatch in the rear axle cover), after
that screw the bolts to the nearest side so
that the bolt heads were parallel to the
longitudinal axis of the tractor;
- with a properly adjusted PTO, the
extension of the rod (7) relative to the
cylinder body cover (the size A, Fig. H-12)
with a running diesel engine must be:
a) in the position “PTO off” (stock
retracted) — from 43 to 49 mm;
b) in the position “PTO on” (stock
extended) — from 63 to 69 mm;
Summary of Contents for 1220.1
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Page 161: ...MTZ 1220 1 1220 3 Section I Coupling of implements I15...
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