2022.3-0000010 OM
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2.16 Controlling sections of the HLL valve group (remote cylinders).
2.16.1 HLL pump control
The HLL pump is located on the coupling clutch body to the left.
The HLL pump switching shaft 1 (figure 2.16.1) has two positions:
- “shaft on” – the shaft is turned clockwise against the stop;
- “shaft off” – the shaft is turned contraclockwise against the stop.
Before turning the shaft 1 to any of 2 two positions, loosen a bolt 3 by 1,5…2 revo-
lutions and turn the shaft 1 together with a locking plate 2. Tighten the bolt 3.
1 – shaft; 2 – locking plate; 3 – bolt; 4 – pressure adjustor in pneumatic system.
Figure 2.16.1 – HLL pump control
Note – The figure 2.16.1 shows the position “HLL pump on”.
ATTENTION: THE PUMP SHALL BE TURNED ON AND OFF ONLY WITH THE
MIN. IDLE SPEED OF THE ENGINE!
In case failures in HLL occur that lead to oil leakage out of the hydraulic lift linkage,
the pump shall be turned off when moving the tractor to repair facilities.
2.16.2 HLL valve group section control
The control handles are located on the right lateral console of the cab. The handles
have the following positions: “neutral”, “lowering”, “floating” and “uplift”.
The handle 3 (figure 2.16.2) controls a left section of the valve group as viewed
along tractor movement (left rear outlets of the hydraulic system). It can be fixed in posi-
tions “floating” and “neutral”. When set into positions “lowering” and “uplift” the handle shall
be held with a hand, when released the handle will automatically return to “neutral” posi-
tion.
The handle 2 controls a middle section of the valve group (middle rear outlets of the
hydraulic system). It can be fixed in positions “floating” and “neutral”. When set into posi-
tions “lowering” and “uplift” the handle shall be held with a hand, when released the handle
will automatically return to “neutral” position.
The handle 1 controls a right section of the valve group (right rear outlets of the hy-
draulic system). It can be fixed in positions “floating”, “neutral” and “uplift”. When set into
position “lowering” the handle shall be held with a hand, when released the handle will
automatically return to “neutral” position. For the valve group of “BOSCH” company the
handle 1 will automatically return from the “uplift” position as the automatic return pressure
is reached (17,5 to 19,5 MPa). Your tractor can be equipped with a valve group of the hy-
draulic unit
70-1523.1 where the handle 1 does not have a mechanism of automatic re-
turn from the “uplift” position. In this case as the uplift operation has been carried out, the
handle 1 shall be returned to the “neutral” position manually.
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