Dong Feng DF254G2-6, Руководство по обслуживанию

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25
Chapter
Ⅳ
Ⅳ Ⅳ
Ⅳ
Operating the Tractor
4.1 Control mechanism and instruments of the tractor
There are various control mechanisms and instruments laid out round the operator’s seat
in the middle part of the tractor. The water thermometer, oil pressure gauge, ammeter,
air-pressure gauge are located on instrument panel. Combination meter can be the option,
which includes electronic tachometer, ammeter, water thermometer, oil pressure gauge
and fuel gauge.
When engine works normally, the water temperature should be within 80 — 95
℃
and
the maximum should not be over 98
℃
; The oil pressure be at 2 — 4 MPa but not lower
than 0.5 MPa while idly running. Ammeter shows the work status of battery, i.e. when the
generator is working and the battery is being charged, the pointer of ammeter should
deflect to “+” side, otherwise the battery is being discharged.
Headlight switch, turning indicator switch, rear working lamp switch, flasher switch,
electric switch are all placed on the lower-rear side of instrument case.
As to the use of the electric switch, please refer to the working diagram (see Fig. 1) of
the Electric switch, i.e. turning the key at “OFF” position to set the circuit off, at “ON”
position to set the circuit live, and “Y” position for preheating. Turning the keyclockwise
to “H” position is for starting engine after preheating. Turning it clockwise to “ST” position
is for starting engine directly without preheating.
Main shift lever is located at the center of gearbox. And the range shift lever is on the right
side of gearbox, shift it forward to get HIGH SPEED RANGE, and push it backward to get
LOW SPEED RANGE (see Fig. 2).
Fig.1 Electric switch Fig.2 Shifting diagram of main shift
working diagram lever and range shift lever
The control handle of PTO speed-changing lever is at left-rear side of driver’s seat, on the
sidewall of rear axle housing. Pull the handle forward to get low speed and push back the
handle to get high speed. Push it to the middle position to get neutral.