MTZ 1220.1, Руководство оператора

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MTZ 1220.1/1220.3 Section D. Construction and Operation
D24
Automatic Differential Lock-Up (ADL)
The ABD feature is designed to improve
the tractor traction and adhesion proper-
ties and off-road capability. It consists of a
two-disk hydraulically operated lock-up
clutch (Fig. E-17) and an electro-hydraulic
control system. The latter ensures two op-
eration modes: “automatic” and “forced”.
Fig. D-18. Rear axle differential lock and FDA drive control system:
1 – control panel; 2 – steering wheel turning angle sensor; 3, 10 – control electro-hydraulic distributors for
the DL and the FDA drive, respectively; 4 – terminal blocks; 5 – connecting cable; 6 – DL control key; 7, 12 –
indicator lamps; 8 – loop; 9 – automatic FDA drive control sensor; 11 – FDA drive control key
The electro-hydraulic DL control system of
the rear axle (Fig. E-18) is composed of a
panel (1), turning angle sensor (2) of
steering wheels; installed on the left-hand
FDA reduction gear, DL control electro-
hydraulic distributor (3) located on the
right-hand GB cover and coupled through
an oil pipeline with the DL clutch, and
connecting cables (5) with terminal blocks
(4). The system is supplied with power
from the on-board electrical circuit via a
safety fuse in the fuse box installed in the
dashboard. The system is powered after
starting the engine. The key (6) for con-
trolling the DL control and DL indicator
lamp (7) are installed on the panel (1)
face. The latter is located over the right-
hand side tractor control panel.
How to Use the Rear Axle DL Control
Key (6)
1. When performing jobs with great
amount of relative slippage of the rear
wheels, depress the upper part of the
key (6) (fixed position), thus, activating
the automatic mode of differential lock-
up. Now the electromagnet of the DL
control electro-hydraulic distributor (3)
is energized, the electro-hydraulic dis-
tributor spool valve moves and discon-
nects the lock clutch from the discharge
line and connects it with the feed port.
Then, the lock-up clutch operates and
interlocks the differential and the rear
wheels. The differential is unlocked
automatically when the steering wheels
turn to a certain degree.
2. If a short-time interlocking of the rear
wheels is necessary, including occa-
sions of turning, press the lower part of
the key (6) and hold it in this depressed
position. When released, the key (6) re-
turns to its middle, fixed position, and
differential interlock unlocks.
.