Remove/install compressor

AR13.30-W-5510E

Remove/install compressor

04.12.2019

Engine

902.9, 906.9, 926.9 in model 957

with code MG7 (Air compressor, 2-cylinder, temperature-optimised)

1

Coolant pipe (return)

6

Compressed-air line

10

Exhaust pipe - only for vehicles with code MS4 (BLUETEC 4 (Euro IV)) or code MS5 (BLUETEC 5)

2

Coolant pipe (feed)

7

2-cylinder compressor

11

Bottom heat shield

3

Hydraulic line (hydrostat fan drive)

8

Power steering pump

12

Resonator

4

Hydraulic line (hydrostat fan drive)

9

Upper heat shield - only for vehicles without code MS4 (BlueTec 4 (Euro IV)) or code MS5 (BlueTec 5)

13

Air intake line

5

Coolant line

7

2-cylinder compressor

15

Holder - only for vehicles with code AN8 (Hydraulically steered leading axle) or code AN9 (Hydraulically steered trailing axle)

17

Coolant line

14

Holder (hydrostat fan drive)

16

Coolant line

Y49

Hydraulic constant throttle solenoid valve - only for vehicles without code (MS8) (natural gas engine)

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

 Warning

Risk of injury to skin or eyes from hydraulic fluid spraying out under pressure.Risk of poisoning from swallowing hydraulic fluid.

Depressurize hydraulic system completely before starting any work on it. Wear protective clothing and safety glasses.

AS00.00-Z-0013-01A

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

 Caution

Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil

Wear protective gloves, protective clothing and safety glasses.
Do not fill engine oil into beverage containers.

AS18.00-Z-0001-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW

Notes on engine oil

AH18.00-N-0101-01HA

 

Remove/install

1

Drain off coolant

Engine 902.9 with code MS8 (natural gas engine), engine 906.9

AR20.00-W-1142C

Engine 902.9 without code MS8 (Natural gas engine), engine 926.9

AR20.00-W-1142J

2

Drain off hydraulic fluid from hydrostatic fan drive



AP20.40-W-2001A

3

Remove exhaust pipe (10)

Only for vehicles without code MS4 (BLUETEC 4 (Euro IV)) or code MS5 (BLUETEC 5)

AR49.10-W-5530E

4

Remove upper heat shield (9)

Only for vehicles without code MS4 (BLUETEC 4 (Euro IV)) or code MS5 (BLUETEC 5)

5

Remove coolant pipes (1, 2)

AR20.20-W-7450AB

6

Remove lower heat shield (11)

7

Remove coolant line (5)

 Collect coolant which flows out.

8

Remove hydraulic line (4) and loosen hydraulic line (3) and lay to the side

AR20.40-W-0400-01A

9

Remove bracket (15) for the hydraulic lines of the auxiliary steering from the dual compressor (7) or from the bracket (14)

Only for vehicles with code AN8 (Hydraulically steered leading axle) or code AN9 (Hydraulically steered trailing axle)

 Do not separate hydraulic lines.

10

Remove compressed-air line (6) of the dual compressor (7) up to the next threaded connection and check for carbonization

If the compressed-air line (6) is carbonized.



Replace compressed-air line (6). In addition, check compressed-air lines between the dual compressor (7), the compressed-air drier, and the four-circuit protection valve.

If the compressed-air lines between the dual compressor (7), the compressed-air drier, or the four-circuit protection valve are carbonized.



Replace respective compressed-air line.

11

Remove fitting of the compressed-air line (6) from the dual compressor (7)

 Installation: Replace sealing ring.

 Fitting, compressed air line to compressor

*BA13.30-N-1007-01A

12

Remove air intake line (13) from the dual compressor (7) and from the resonator box (12)

13

Remove hydraulic constant throttle solenoid valve (Y49)

Only on vehicles without code (MS8) natural gas engine

AR01.50-W-2000B

14

Remove power steering pump (8)

AR46.30-W-0500E

15

Remove holder (14) on crankcase

16

Remove coolant line (16, 17) from the dual compressor (7)

 Banjo bolt, coolant line to compressor

*BA13.30-N-1004-01A

17

Remove dual compressor (7)

 Collect escaping engine oil.

 Installation: Turn drive gear, if necessary. Tighten bolts diagonally.

 Bolt, compressor to crankcase

*BA13.30-N-1006-01A

18

Remove O-ring from the dual compressor (7)

19

Install in the reverse order

20

Check engine oil level with oil dipstick or on display, add oil if necessary

 Observe engine oil quality set in maintenance system or Specifications for Operating Fluids.

21

Start engine and allow to run in idle; oil pressure must have built up after about 10 s, then run the engine at varying rpms

22

Check the compressed air line (6) and air intake duct (13) for leaktightness with the engine running

23

Turn off engine

24

Check and correct hydraulic fluid level



AP20.40-W-2001A

25

Bleed steering system

Steering gear 765.82

AR46.25-W-3300C

Steering gear 765.889/896

AR46.25-W-3300A

26

Check hydraulic system, cooling system, and dual compressor (7) for leak tightness

 Visual inspection.

 Compressor (compressed air system)

Number

Designation

ENGINE 900.9, 902.9, 904.9, 906.9

ENGINE 924.9, 925.9, 926.9

BA13.30-N-1004-01A

Banjo bolt, coolant line to compressor

Nm

40

40

 Compressor (compressed air system)

Number

Designation

ENGINE 900.9, 902.9, 904.9, 906.9

ENGINE 924.9, 925.9, 926.9

BA13.30-N-1006-01A

Bolt, compressor to crankcase

Nm

50

50

 Compressor (compressed air system)

Number

Designation

ENGINE 900.9, 902.9, 904.9, 906.9

ENGINE 924.9, 925.9, 926.9

BA13.30-N-1007-01A

Fitting, compressed air line to compressor

Nm

90

90