Check delivery rate of compressor

AR13.30-W-0004MD

Check delivery rate of compressor

04.08.2015

Engine

934.9, 936.9 in model 967

Engine

936.9 in model 956, 963, 964

Shown: model 963 with a 1-cylinder air compressor with control line (4.1)

0

Suction connection

3

Check-compressed air reservoir

8

Measuring hose

1

Air compressor

4.1

Control line

9

Test kit

2

Fitting (working connection)

5

Safety valve

10

Pressure gauge

2.1

Compressed-air line

6

Connection (for measuring hose)

2.2

Check-compressed air hose

7

Shutoff valve

 Danger !

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 Danger !

Risk of injury caused by body parts being pinched or crushed as cab is tilted

Ensure that no one is within the tilting range of the cab as it is being tilted. Always tilt the cab all the way to the end position and secure with the safety strut.

AS60.80-Z-0001-01A

 Danger !

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



Notes on avoiding damage through contamination and foreign objects

AH00.00-N-5000-01H



Notes on tilting the cab

AH60.80-N-0003-01A



Remove

1

Start engine and bring to normal operating temperature then switch off engine

 Coolant temperature about 70 to 95°C.

2

Tilt cab

3

Remove air intake duct on intake connection (0)

4

Remove air line (2.1) on fitting (2)

5

Remove control line (4.1) on air compressor (1)

Only for vehicles which are fitted with an air compressor (1) with control line (4.1).

 By taking this measure one can ensure that the air compressor (1) is also in the delivery phase if the output of the air compressor (1) is impaired by another defect, for example one on the pressure regulator.

6

Check test-compressed air reservoir (3) for perfect working order



000 588 00 21 00 Leak tester

WS13.00-P-0016B

 Check safety valve as well as all connections with a commercially available leak detection spray. Drain off the existing condensation if necessary.

7

Attach test-compressed air reservoir (3) with test-compressed air hose (2.2) to fitting (2)

8

Attach test kit (9) with a measuring hose (8) to test-compressed air reservoir (3)

 Test kit

*360589002100



Check

9

Perform a filling time check

 in order to perform the fill time test the engine and the time recording device must be started at the same time.
While the engine runs at idle speed, the pressure rise in the test-compressed air reservoir (3) must be monitored.
Upon reaching the prescribed pressure the time recording device must be stopped and the engine also stopped.

Fill time test (with test compressed air reservoir and test kit)

*BE13.30-N-1001-01N

10

Evaluate filling time checking

 Compare required time with the permissible fill time.

Fill time test (with test compressed air reservoir and test kit)

*BE13.30-N-1001-01N

If the permissible filling time is exceeded:



Replace air compressor (1).

Engine 936.9 in model 963, 964 with a 1-cylinder air compressor

AR13.30-W-0001MD

Engine 934.9, 936.9 in model 967 with a 1-cylinder air compressor

AR13.30-W-0001NA

Engine 936.9 in model 963, 964 with a 2-cylinder air compressor

AR13.30-W-0002MD

Engine 936.9 in model 956 with a 2-cylinder air compressor - except vehicles with a gaseous fuel engine

AR13.30-W-0002NE

Engine 936.9 in model 956 with a 2-cylinder air compressor - vehicles with a gaseous fuel engine

AR13.30-W-0002NG

11

Perform pressure drop measurement

 The factor measured is the pressure drop over the seals in the air compressor (1) in a prescribed period of time.

Pressure drop measurement

*BE13.30-N-1002-01N

If the pressure drop is too high:



Replace air compressor (1).

Engine 936.9 in model 963, 964 with a 1-cylinder air compressor

AR13.30-W-0001MD

Engine 934.9, 936.9 in model 967 with a 1-cylinder air compressor

AR13.30-W-0001NA

Engine 936.9 in model 963, 964 with a 2-cylinder air compressor

AR13.30-W-0002MD

Engine 936.9 in model 956 with a 2-cylinder air compressor - except vehicles with a gaseous fuel engine

AR13.30-W-0002NE

Engine 936.9 in model 956 with a 2-cylinder air compressor - vehicles with a gaseous fuel engine

AR13.30-W-0002NG

12

Depressurize test-compressed air reservoir (3) at the stopcock (7)

13

Remove test-compressed air reservoir (3) with test-compressed air hose (2.2) at fitting (2)

14

Inspect compressed-air line (2.1) for carbonization

 In the event of carbonization, also check compressed air lines between air compressor (1), compressed air drier and the four-circuit protection valve or the Electronic Air-Processing Unit (EAPU); replace the carbonized parts if necessary.



Install

15

Attach air line (2.1) to fitting (2)

 Union nut, air line to fitting for compressor

*BA13.30-N-1008-01N

16

Attach control line (4.1) from air compressor (1)

Only for vehicles which are fitted with an air compressor (1) with control line (4.1).

17

Attach air intake duct to intake connection (0)

18

Start engine and run at idling speed

19

Check line interfaces on the air compressor (1) for leaktightness

 Visual inspection.

20

Turn off engine

21

Tilt back cab

22

Print out questionnaire and fill out completely

Only if the air compressor (1) was replaced and if the cost acceptance was applied for as part of the warranty and goodwill.



Questionnaire for checking delivery rate and oil ejection of compressor, form

OF13.30-W-1000-02A

 For a warranty or goodwill claim the removed air compressor (1) must be submitted for inspection together with the completely filled out questionnaire and the test sheet used when testing for oil ejection.

Compressor

Number

Designation

Engine 934.9, 936.9
with code M6N (Air compressor, single-cylinder)

Engine 936.9
with code M6L (Air compressor, 2 cylinder)

BE13.30-N-1001-01N

Fill time test (with test compressed air reservoir and test kit)

Volume of test compressed air reservoir

Liter

40

40

Permissible fill time

s

180

100

Specified pressure

bar

12

12

Engine speed

1/min

500

500

Compressor

Number

Designation

Engine 936.9
with code M6M (Air compressor, 2-stage, for optimised consumption)

BE13.30-N-1001-01N

Fill time test (with test compressed air reservoir and test kit)

Volume of test compressed air reservoir

Liter

40

Permissible fill time

s

280

Specified pressure

bar

12

Engine speed

1/min

500

Compressor

Number

Designation

Engine 934.9, 936.9
with code M6N (Air compressor, single-cylinder)

Engine 936.9
with code M6L (Air compressor, 2 cylinder)

BE13.30-N-1002-01N

Pressure drop measurement

Permissible pressure drop

bar

1

1

Test duration

min

4

4

Compressor

Number

Designation

Engine 936.9
with code M6M (Air compressor, 2-stage, for optimised consumption)

BE13.30-N-1002-01N

Pressure drop measurement

Permissible pressure drop

bar

2,5

Test duration

min

4

 Compressor (compressed air system)

Number

Designation

Engine 934.9

Engine 936.9

BA13.30-N-1008-01N

Union nut, air line to fitting for compressor

Nm

75

75