Engine | 457.9 in model 374, 375, 940, 942, 943, 944 |
with code MY2 (Air compressor, 2-cylinder, two-stage) | |
Engine | 457.9 in model 374, 375, 940, 942, 943, 944 |
with code MZ7 (Air compressor, 1-cylinder, regulated) | |
Engine | 457.9 in model 374, 375, 940, 942, 943, 944 |
with code MZ8 (Air compressor, 2-cylinder, regulated) |
W13.30-1165-09
1 | Air compressor | 3 | Check-compressed air reservoir | 8 | Measuring hose | ||
2 | Fitting (working connection) | 5 | Safety valve | 9 | Test kit | ||
2.1 | Compressed-air line | 6 | Connection (for measuring hose) | 10 | Pressure gauge | ||
2.2 | Check-compressed air hose | 7 | Shutoff valve |
0 | Suction connection |
0.1 | Air intake duct |
0.2 | Resonator |
1 | Air compressor |
4 | Control connection |
4.1 | Control line |
W13.30-1166-12
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. | |
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. | |
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. | |
| Notes on tilting the cab | ||
| 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 (0.1) on resonator (0.2) | ||
4 | Remove resonator (0.2) | ||
5 | Remove control line (4.1) on air compressor (1) | Engine 457.9 with code MZ7 (Air compressor, 1-cylinder, regulated) or code MZ8 (Air compressor, 2-cylinder, regulated) | |
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 | Remove air line (2.1) holder on timing case | ||
7 | Remove air line (2.1) on fitting (2) | ||
8 | Check test-compressed air reservoir (3) for perfect working order | ||
| 000 588 00 21 00 Leak tester | ||
Check safety valve as well as all connections with a commercially available leak detection spray. Drain off the existing condensation if necessary. | |||
9 | Attach test-compressed air reservoir (3) with test-compressed air hose (2.2) to fitting (2) | ||
10 | Attach test kit (9) with a measuring hose (8) to test-compressed air reservoir (3) | Test kit | |
| Check | ||
11 | 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. | |
Filling time test (with test compressed air reservoir and test kit) | |||
12 | Evaluate filling time checking | Compare required time with the permissible fill time. | |
Filling time test (with test compressed air reservoir and test kit) | |||
If the permissible filling time is exceeded: | |||
| |||
Replace cylinder head of the air compressor (1). | |||
| |||
| |||
Vehicles with code MY2 (Air compressor, 2 cylinder, two stage) | |||
13 | 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 | |||
If the pressure drop is too high: | |||
| |||
Replace cylinder head of the air compressor (1). | |||
| |||
| |||
Vehicles with code MY2 (Air compressor, 2 cylinder, two stage) | |||
14 | Depressurize test-compressed air reservoir (3) at the stopcock (7) | ||
15 | Remove test-compressed air hose (2.2) on fitting (2) | ||
16 | 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 EAPU; replace the carbonized parts if necessary. | |
| Install | ||
17 | Attach air line (2.1) to fitting (2) | Union nut, compressed air line to fitting | |
18 | Attach air line (2.1) holder to timing case | ||
19 | Attach control line (4.1) from air compressor (1) | Engine 457.9 with code MZ7 (Air compressor, 1-cylinder, regulated) or code MZ8 (Air compressor, 2-cylinder, regulated) | |
Banjo bolt, control line to compressor | |||
20 | Attach resonator (0.2) | ||
21 | Attach air intake duct (0.1) on resonator (0.2) | ||
22 | Start engine and run at idling speed | ||
23 | Check line interfaces on the air compressor (1) for leaktightness | Visual inspection. | |
24 | Turn off engine | ||
25 | Tilt back cab | ||
26 | 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 | ||
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. |
Check values for air compressor |
Number | Designation | Engine 457.9 with code MZ8 (Air compressor, 2-cylinder, controlled) | Engine 457.9 with code MZ7 (Air compressor, 1-cylinder, controlled) | ||
BE13.30-N-1001-01L | Filling time test (with test compressed air reservoir and test kit) | Volume of test compressed air reservoir | Liter | 40 | 40 |
Permissible filling time | s | 90 | 150 | ||
Specified pressure | bar | 12 | 12 | ||
Engine speed | 1/min | 550 | 550 |
Check values for air compressor |
Number | Designation | Engine 457.9 with code MY2 (Air compressor, 2-cylinder, two-stage) | ||
BE13.30-N-1001-01L | Filling time test (with test compressed air reservoir and test kit) | Volume of test compressed air reservoir | Liter | 40 |
Permissible filling time | s | 250 | ||
Specified pressure | bar | 12 | ||
Engine speed | 1/min | 550 |
360 589 00 21 00
Test kit
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