Use and Maintain Exterior Cab Devices-100% best professional
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2022-07-08
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How to Use and Maintain the HOVA Range of Internal Combustion Tractor Interior Cab Devices?
2022-08-05

How to Use and Maintain The HOVA Range of Internal Combustion Tractor Exterior and Interior Cab Devices

exterior-cab-devices2

Use the door switch outside

1. Left door

Open the door: If the door is in the “fully closed” position but not locking status, directly pull the handle down and outward to open the door; if the door is in locking status, use the key to turn the critical cylinder clockwise about 60°and then pull the handle down and outward to open the door.

Close the door: slam the door to make it in the “fully closed” position. If you lock the door, use the key to turn the critical cylinder anticlockwise about 10°, and then pull the key out. Pulling the handle cannot open the door now.

exterior-cab-devices-20

2. Back sliding door

Open the door: the door is in “fully closed” position but not locking status, directly pull the door locking handle to the left and then push the handle of back door soon to the left to open the door; if the door is in locking status, use the key to turn the key cylinder anticlockwise about 180°and then pull the door locking handle again to open the door.

Close the door: slam the door to make it in “fully closed” position. If lock the door, use the key to turn the key cylinder clockwise about 180° and then pull the key out. Pulling the handle cannot open the door now.

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Use the door switch inside

1. Left door

Open the door: pull the inside lock handle outward to open the door lock, and then push the handle outward to open the door.

Close the door: slam the door to make it in “fully closed” position, and the door is closed. If lock the door completely, use the key to lock it outside.

exterior-cab-devices-6

2. Back sliding door

Open the door: put the inside lock knob of the back door in “U” position, pull the handle to the left to open the door lock, and then push it to the right to open the
door.
Close the door: put the inside lock knob of the back door in “U” position, slide the door to the left to close to make it in “fully closed” position, and the door is
closed. If lock the door completely, put the inside lock knob in “L” position in “fully closed” position, and pulling the handle cannot open the door now.

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Opening and closing of engine hood

1. Opening of engine hood

(1) Grasp and pull the handle up to open the engine hood.

2. Closing of engine hood

(1) Grasp and pull the handle down to close the engine hood, and the hood is automatically locked.

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Cab front shield

(1) The front shield is inside of the cab and close to the right side of the instrument board (as shown in Figure 1.9). Pull it outward to open the front shield;
Pull it down to close the front shield, and the shield is automatically locked (as shown in Figure 1.10).
(2) The electrical appliances box is on the right side of the front shield, open the shield, and see the box (as shown in Figure 1.11).

exterior-cab-devices

Cab turnover

1. Cab turnover operation

1.1 Park the tractor on the flat road and take out the unsecured articles in the cab before turnover. (as
shown in Figure 1.12)
1.2 Nobody can stand nearby in front of the cab at the time of turnover! (as shown in Figure 1.13)
1.3 Pull the switch handle of lifting oil pump to “↑” position, and press the button of lifting oil pump (as shown
in Figure 1.16) to turn over until the cab is turned over completely by dead weight (straighten it with limit
drawstring). (as shown in Figure 1.14)
1.4 Turn the cab back to original position: pull the switch handle of lifting oil pump to “↘” position, and press
the button of oil pump to turn the cab back (as shown in Figure 1.15) until the locking pin inserts into the
hydraulic lock piece and continue pressing it until the cab do not move any more, and keep the switch
handle in “↘” position.

exterior-cab-devices-9

2. Refueling and exhaust of turnover system

2.1 Open the oil plug (as shown in Figure 1.16) to fill the stipulated hydraulic oil.
2.2 Turn over the cab with hand pump as continue to fill the oil.
2.3 Make the cab fall and meanwhile let excess oil overflow.
2.4 Turn back the cab to original position with the oil pump, check and refill the oil until fill it up.
2.5 Screw up the oil plug finally.

3. Function check of turnover system

3.1 Turn the cab forward to the top dead center, and check the cab fall condition after exceeding the top dead center; if the system works normally, the cab
shall fall slowly under the damping condition, without impact phenomenon.
3.2 Turn the cab over about 30º, the cab shall keep in this position for 20 min and not go down.

interior-cab-devices

Internal Devices

  1. Rockerswitcharea
  2. Transmission oil temperature gauge
  3. Steering wheel
  4. Combination instrument

5. Engine speed per hour

6. Gearbox shifter

7. Air-conditioning air outlet

8. Air-conditioning control panel

9. LNG liquidometer

10. Parking brake handle 

11. Electric cigarette lighter

12. Saddle air lock switch

Instrument board

interior-cab-devices
  1.  Speedometer
  2.  Water temperature gauge
  3. Fuel gauge

4. Small mileage/small mileage fuel consumption reset button

5. Information display screen

6. Barometer 1

7. Barometer 2

8. Engine speed meter 

9. Signal light

Summary sheet of symbols of signal lights

Function specifications of signal light

No.1234567891011
Symbol
ColorRedRedRedRedRedRedRedRedRedBlue

Flash 

green

Name

fety

belt

locking

Char-

ging indica-

tion

Water 

tempe-

rature

Steering oil position

Warning

and 

stop

Cab

 locking

Brake air pressure 2Brake air pressure 1

Engine

oil

pressure

High

beam

indication

Left 

steering

No.1213141516171819202122
Symbol
Color

Flash 

green

Flash 

green

RedYellowYellowGreenYellowGreenGreenGreenGreen
Name

Right 

steering

Trailer

 steering

Parking brake

Air

filter 

blocking

Common 

alarm

Front

fog

lamp

Rear

fog

lamp

Power takeoff

Wheel 

different-

tial 

indication

Axle 

different-

ial 

indication

All-

wheel

 drive

No.2324252627282930313233
Symbol
ColorGreenGreenYellowYellowYellowYellowYellowYellowRedYellowGreen
Name

High

gear

section

Low

gear

section

ASB of

main vehicle

Trailer 

ABS

Air 

suspe-

nsion

Lifting 

shaft

ASR

Low

fuel

oil

level

Auxiliary 

gas

Exhaust 

brake

Retarder
No.3435363738394041424344
Symbol         
ColorYellowYellowColorColorColorColorColorColorColorColorColor
Name

EDC 

failure

Flame 

preheat

ing

StandbyStandbyStandbyStandbyStandbyStandbyStandbyStandbyStandby
No.NameRemarksNo.NameRemarks
1

Seatbelt

indicator

 light

It goes out after fasten the seatbelt

(not available temporarily)

19Power takeoff indicator lightIndication of power takeoff operation
(optional for some types)
2

Charging

indicator

 light

It goes out after the engine works20Indicator light of wheel differential valveication of operation of
wheel differential valve
(not available temporarily)
3

Water 

temperature indicator

 light

Water temperature alarm21Indicator light of axle differential valveIndication of operation of
 axle differential valve
(optional for some types)
4

Steering 

oil level

indicator

 light

Steering oil level alarm 

(not available temporarily)

22All-wheel drive indicator light

Indication of operation of

all-wheel drive

(not available temporarily)

5

Warning

parking indicator

 light

5 failure types of engine racing23IndicatorIndication of high gear section
6

Cab

locking

indicator

light

Confirmation of locking switch

(not available temporarily)

24Indicator light of low gear sectionIndication of low gear section
7

Brake

air

pressure 2

indicator 

light

Alarm of brake air pressure 225Indicator light of main vehicle ASB

Indication of action of ABS

(main vehicle)

(not available temporarily)

8

Brake

air

pressure 1

indicator

 light

Alarm of brake air pressure 126Indicator light of trailer ABSIndication of action of ABS1
 (trailer) 
(not available temporarily)
9

Engine oil 

pressure

indicator 

light

Oil pressure alarm27Air suspension indicator lightIndication of air suspension 
(not available temporarily)
10

High

 beam 

indicator

light

Indication of the high beam lit28Indicator light of supporting axel liftingLifting indication 
(not available temporarily)
11

Left

steering indicator

light

It lights up with left steering light29ASR anti-sideslip indicator light

It lights up when ASR system acts

(not available temporarily)

12

Right

steering indicator

light

It lights up with right steering light30Indicator light of low fuel oil levelRemind timely refueling
13

Trailer 

steering indicator 

light

It lights up with left or right 

steering light in case of a trailer

(not available temporarily)

31Auxiliary gas indicator lightIndication of low pressure of
auxiliary gas loop
14

Parking

brake

indicator

light

Indication when pulling down hand brake valve32Exhaust brake indicator lightIndication of use of
exhaust brake of the engine
15

Air 

filter 

blocking indicator 

light

Alarm of air filter blocking33Retarder indicator lightIndication of use of retarder 
(not available temporarily)
16

Common

 alarm indicator

 light

It lights up in case of minor failure34EDC failure indicator lightIndication of EDC failure
17

Front

fog

lamp indicator light

Indication of the front fog lamp lit35Flame preheating indicator lightIndication of use of flame preheating of the engine (not available temporarily)
18Rear fog lamp indicator lightIndication of the rear fog lamp lit (not available temporarily)   

Signal switch and function (excluding rocker switch):

No.Signal functionRemarks
1Intermittent wiper (combination switch 31B)Switch on (with 15#) means the function is enabled
2Washer pump (combination switch 56)Switch on (with 15#) means the washer pump is in operation
34 key gears (starting signal)Switch on (with 15#) means the function is enabled
4D+ signal, making the engine in operationEffective at high potential (>12V)
5S9 exhaust brake switchSwitch on (equivalent to shell overlapping) is effective
6S30 spring energy storage switchSwitch on (equivalent to shell overlapping) that the “parking brake indicator light”
 on the instrument board lights up
7S31 air pressure signal switchSwitch on (equivalent to shell overlapping) that the “auxiliary gas indicator light” 
on the instrument board lights up
8S51 water temperature alarm switchSwitch on (equivalent to shell overlapping) that the “water temperature 
alarm indicator light” on the instrument board lights up
9S69 steering oil level switchSwitch on (equivalent to shell overlapping) that the “steering oil level
 indicator light” on the instrument board lights up
10S27 cab locking switchSwitch on (equivalent to shell overlapping) that the
“cab locking indicator light” on the instrument board lights up
11S28/1 brake air pressure 1 signal switchSwitch on (equivalent to shell overlapping) that the “brake air pressure
 1 indicator light” on the instrument board lights up
12S28/2 brake air pressure 2 signal switchSwitch on (equivalent to shell overlapping) that the “brake air pressure
 2 indicator light” on the instrument board lights up
13S32 oil pressure alarm switchSwitch on (equivalent to shell overlapping) that the “oil pressure alarm
 indicator light” on the instrument board lights up
14S29 air filter blocking switchSwitch on (equivalent to shell overlapping) that the “air filter blocking indicator light” on the instrument board lights up
15S10 brake lamp switchSwitch on (with 15#) means function confirmation
16S15 reverse gear switchSwitch on (equivalent to shell overlapping) means in reverse gear
17S24 power takeoff in-position switchSwitch on (equivalent to shell overlapping) that the corresponding indicator light on the instrument board starts flashing to full brightness
18S20/S21 wheels differential in-position switchSwitch on (equivalent to shell overlapping) that the corresponding indicator light on the instrument board starts flashing to full brightness
19S22 axle differential in-position switchSwitch on (equivalent to shell overlapping) that the corresponding indicator light on the instrument board starts flashing to full brightness
20S25 all-wheel drive in-position switchSwitch on (equivalent to shell overlapping) that the corresponding indicator light on the instrument board starts flashing to full brightness
21S33 *** Front range box switchSwitch on (equivalent to shell overlapping) that the “indicator light of high gear section” on the instrument board lights up
22S26 creeper gear switchSwitch on (equivalent to shell overlapping) that the “indicator light of low gear section” on the instrument board lights up
23S48/S49 horn switchSwitch on (switch equivalent to shell overlapping) that the horn (klaxon or air horn) sounds
24S14 neutral position switchSwitch on (equivalent to shell overlapping) means the “ neutral position”
25ABS_1 signalSwitch on (equivalent to shell overlapping) that the “ indicator light of main vehicle ASB1” on the instrument board lights up
26ABS_2 signalSwitch on (equivalent to shell overlapping) that the “ indicator light of trailer ASB2” on the instrument board lights up
27Cab opening signalSwitch on (equivalent to shell overlapping) is effective
28ECAS1Switch on (equivalent to shell overlapping) means the function is enabled
29ECAS2Switch on (equivalent to shell overlapping) means the function is enabled
30S40 pressure switch of hydraulic pipelineSwitch on (equivalent to shell overlapping) means the function is enabled
31High beam switch (combination switch S3-56a)Switch on (equivalent to shell overlapping) means the function is enabled
32Low beam switchSwitch on (equivalent to shell overlapping) means the function is enabled
 (combination switch S3-56b) 
33Left steering switch (combination switch S3-6)Switch on (equivalent to shell overlapping) means the function is enabled
34Right steering switch (combination switch S3-7)Switch on (equivalent to shell overlapping) means the function is enabled
35support shaft mode switchSwitch on (equivalent to shell overlapping) means the special mode function is enabled

 

Graphic symbols of rocker switches

No.12345678
NameLight switchFront fog 
lamp switch
Emergency alarm switchSwitcherEmergency
 warning 
light switch
Axial 
differential 
switch
Work light 
switch
Power
takeoff

Graphical sign

Symbol and colorDual green 
LED light
Dual green
LED light
Red cover, dual red LED lightDual green 
LED light
Dual red
 LED light
Yellow 
LED light
Dual green 
LED light
Red LED
 light
No.9101112131415 
NameEngine brake switchSaddle lifting switchPower switchEngine 
diagnostic 
switch
Gearbox
diagnostic
 light
Engine diagnostic 
light
Instrument menu knob 

Graphical sign

1

 
Symbol and colorDual green 
LED light
Green LED 
light
Red LED lightDual yellow 
LED light
LED Red 
and yellow LED light
Dual yellow 
LED light
  

 

interior cab devices

Function specifications of rocker switches (indicator lights included. Unless otherwise stated, the key start switch in gear 1 is invalid )

interior-cab-devices
interior-cab-devices

Description: ** when the axis difference switch is pressed, the axis difference signal light on the instrument flashes, if the axis difference lock signal switch has a feedback signal within 5s, the axis difference signal light is lit; in case of no feedback signal, check the drive output of axis difference magnetic valve, if the drive output is normal, the axis difference signal light is lit. The lamp may have fogged with a big humidity change and fog disappears if the light is on.

Power switch

1. Main power switch

The main power switch is outside the battery compartment (getting-on ladder) of the left longitudinal beam of the frame.
Note: when the tractor stops for a long time, turn off the main power switch to avoid an accident.

interior-cab-devices

2. Key start switch

The key start switch is arranged on the right of the instrument desk.

Turning positionUsageRemarks
1 (LOCK)Outage of whole tractorThe key can be pulled out now
2(ACC)Connect the electric equipment when the tractor stops 
3 (ON)Driving position 
4 (START)Start the engineAutomatic reset to gear 3
interior-cab-devices
interior-cab-devices-1

Combination switch

1. Operation of turn light:

interior-cab-devices-2

Note: when the turn light works, the steering indicator light on the instrument board flashes meanwhile. When the turn light bulb is damaged (total power of the bulb is less than 21W), the flashing frequency is increased (work in frequency multiplication), the steering indicator light also gives the indication of frequency multiplication, and meanwhile, the information screen displays the failure. 

2. Emergency alarm

Turn on the main power switch, press the emergency alarm switch (as shown in Figure 2.6), and all turn lights and steering indicator
lights flash.

3. Headlight operation:

The combination switch handle is in neutral position, the key switch is in gear 3, the light switch (as shown in Figure 2.7) is in gear 2, the low and high beams of the headlight (as shown in Figure 2.8) are lit. Now, the combination switch handle is pulled up to 4 degrees, the high and low beams are completely lit and can be as instantaneous light of night overtaking or passing; the handle is pulled up continuously to 10 degrees, the changing light is available: the high beam becomes the low beam or the low beam becomes the high beam. Let go of the handle.
At the time of day overtaking or passing, the handle is pulled up to 4 degrees, the high beam is lit, and let it go and it is automatically reset.

4. Wiper operation

0—Closed position J– Wiper intermittent gear
I– Wiper slow gear II– Wiper fast gear
Press — windshield washing system

interior-cab-devices-4

5. Horn button

interior-cab-devices-5

The tractor is equipped with the klaxon and electrically controlled air horn and they are switched by a horn switcher.
The horn button is on the steering wheel. In case of use of electrically controlled air horn, press the horn switch (rocker switch)
and horn button on the steering wheel successively.

Operation of fog lamp and interior lighting

interior-cab-devices-5

1. Operation of front fog lamp

The light switch is in gear 1;
Press the front fog lamp switch (as shown in Figure 2.14) and the front fog lamp (as shown in Figure 2.13) is turned on. Meanwhile, the front fog lamp indicator
light on the instrument board is lit (as shown in Figure 2.15).
Note: the front fog lamp can be operated only when the light switch is turned on.

2. Interior lighting

interior-cab-devices-1

(1) Turn on the interior lighting switch
(2) Press the left or right side of the switch on the interior light, and the interior lighting system will be lit always.
(3) Turn off the interior lighting switch
Put the switch on the interior light in neutral position.

Seat

1. Air suspension seat

The optimization, matching and combination of air spring and hydraulic damping are made
for the seat.
The suspension seat consists of the air spring, leveling valve, hydraulic damper, metal
member, breakdown prevention elastic parts, etc.
The seat height can be adjusted according to the people weight and road situation, which
greatly improves the comfort of the seat.

39c8a2e43327cd8cdca27bc268a452a

Technical parameters
Seat width: 500mm
Seat height: 865mm (maximum)
Height adjustment: 7 gears within the range of 0 – 65mm
Forward and backward adjustment: 5 gears within the range of 0 – ±75mm
Backrest angle adjustment: 0° – 41.4°(backward from the plumb line) and 0° – 60° (forward
from the plumb line)

Use method
1) Adjustment of backrest elevation pull the handle 1 up to turn the backrest to the required degree, loosen the handle, and lock the backseat position.
2) Adjustment of rear-end height
Softly pull the handle 2 up, meanwhile, apply appropriate force upward (downward) to the rear end of the seat to make the rear end go down (up) to required
position, and loosen the handle.
3) Adjustment of rear-end height
Softly pull the handle 3 up, meanwhile, apply appropriate force downward (upward) to the rear end of the seat to make the rear end go down (up) to required
position, and loosen the handle.
4) Adjustment of anteroposterior position
Pull the handle 4 up to move the seat forward and backward to the required position, and loosen the handle.
5) Height locking handle
The seat will be in the lowest position when the airbag or other damping component is damaged or invalid; for the convenience of driving, the seat can be lifted to
appropriate height, the handle 5 is turned from horizontal position to the vertical position (bottom seat plane as datum plane) and locked to keep the seat at fixed
design height.

Note: in the case of an air spring seat, pay attention to the height locking handle on the front lower part of the seat, the horizontal position is inflating position
and vertical position is lock position.

Transmission shifting

1.Push-button gear selector (automatic gearbox is as shown in Figure 2.18)

(1) Forward gear s switch (press Button D)
When speed it up, the gearbox will automatically rise from the available lowest gear to the top gear in
order;
When slow it down, the gearbox will automatically change gears down;
(2) Reverse gear switch (press Button R)
When selecting the reverse gear, the tractor must stop completely, the engine returns to the idle state, switch to the
reverse gear through neutral gear, and now the shifter displays “R”;
(3) Neutral gear switch (press Button N)
In the neutral gear state, the selector displays “N”.

(4) Gear shift mode switch
According to different road conditions and loads, the economic mode and power mode can be selected;
In power mode, the display screen will display “MODE”.

Economic mode: default operation mode, the fuel consumption is low but the power take-off is relatively
poor;
Power mode: at the time of operation in power mode, more power take-off is available,
but shifting point is relatively delayed and the fuel consumption is increased.
Note: the power mode is recommended only when the tractor seriously lacks of power,
or goes up the slope, or is supercharged.
(5) After selecting gear D, manual upshift or downshift can be realized by pressing the upshift button ↑ or
downshift ↓.
Figure 2.19
31
(6) Read the oil level of the gearbox by the shifter
Entry mode: press both upshift button ↑ or downshift ↓;
Exit mode: exit the oil level check mode by pressing the neutral gear button N;
Conditions for oil level check:
① The tractor is parked on level road;
② The engine is in idle running state;
③ The gearbox is in neutral gear state;
④ The rotational speed of output shaft is zero;
⑤ Tense the parking brake;
⑥ The oil level of the gearbox is stable;
⑦ The oil temperature of the gearbox is in normal
measurement range of 60-104℃.
Note: see the Allison Operation Manual attached for detailed operation process

2. Shifting handle (mechanical gearbox as shown in Figure 2.20 and 2.21)

The shifting handle of the transmission feels good, simple in operation, and greatly reduces the driver’s labor intensity. It is installed on the cab floor, seldom has
gear off problem, and does not affect the cab turnover.

1. Control mechanism
The control mechanism of ZF transmission (S6-120) is mechanical soft-axes control and simple in gear shift. There are six forward gears and one reverse gear.
Two pictures above show the position chart of shifting handle of the shifting mechanism and transmission position (position of guide block of top cover).

Parking brake

(1) Position in Figure 2.22 is the parking brake position.
(2) Loosen the hand brake, push the handle forward and upward successively in the direction of driver
(you can hear the louder deflated sound)
(3) Parking brake, pull the handle down (you can hear inflation sound)

Unlocking control button of traction seat

Using the traction seat can make the tractor go up and down, and this is automatic reset gas-controlled
switch (as shown in Figure 2.23)
Press the traction seat to unlock; the internal mechanism in the traction seat is automatically locked under
the forward impact of traction pin.
Note: please don’t press on driving

Saddle lifting

Type of lifting cylinder

There are three types of lifting cylinder for saddle-lifting tractor:
Single-stage double-acting cylinder (lifting height of 405);
Double-stage double-acting cylinder (lifting height of 705);
Double-stage single-acting cylinder (lifting height of 705);

Saddle lifting operation

Saddle lifting operation: switch on the power, the key start switch is in gear 2
(ACC) or 3 (ON), long press “1” face of the rocker switch (Figure 2.23), and the
saddle is lifted;
Saddle lowering operation: switch on the power, the key start switch is in gear 2
(ACC) or 3 (ON), long press “2” face of the rocker switch (Figure 2.23), and the saddle is lowered;

Seatbelt

1. Fasten the seatbelt
Pull the lock catch for the seatbelt (as shown in Figure 2.26) bypassing the shoulder, put the latch into the buckle
until they are meshed.
2. Unfasten the seatbelt
Press the red button on the lock catch for the seatbelt in the direction of arrow, pull the latch out, and make the
seatbelt automatically return to original position.
Note: please fasten the seatbelt before driving every time! Check the situation and function of seatbelt
every day.
3. Seatbelt alarm description
2.3.1. Turn the key switch to the driving position, and if the seatbelt is well fastened, the seatbelt lock signal light
on the instrument board is out; if not, the signal light is always lit and the buzzer does not ring.
2.3.2. After the engine starts, and if the seatbelt is not well fastened, the seatbelt lock signal light is lit, and the
buzzer rings at low frequency and stops ringing after 6s; after the seatbelt is well fastened, the signal light goes
out and meanwhile the buzzer stops ringing.
2.3.3. During the engine operating process, if pull the seatbelt out, the signal light will be lit and the buzzer will ring
at low frequency for 6s.

Other internal devices

Cup base (as shown in Figure 2.28 and 2.29)

The cup base is in the left side of the cab and close to the instrument desk: pull outward to open the cup base to place the cup, and return to original position if it
is not used

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