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) |
W13.30-1235-09
Shown on engine 457.9 with a 2-cylinder air compressor |
0.2 | Resonator | 2.2 | Check-compressed air hose | 7 | Test kit | ||
1 | Air compressor | 3 | Oil ejection test equipment (adapter) | 11 | Test sheet | ||
2 | Fitting (working connection) | 5 | Measuring hose | ||||
2.1 | Air line (operating line) | 6 | Pressure gage |
3 | Oil ejection test equipment (adapter) |
8 | Cable tie |
9 | Adjustment lever |
10 | Compressed air outlet |
11 | Test sheet |
W13.30-1224-06
Oil ejection normal - the diagnostic findings are visibly black but perceptibly dry |
A | 60 mm |
W13.30-1221-12
Oil ejection too high - the diagnostic findings are visibly black but perceptibly wet |
A | 60 mm |
W13.30-1222-12
Warning | 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. | |
Warning | 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. | |
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 buttoned-up and snug-fitting work clothes. Do not touch hot or rotating parts. | |
Topical note | Notes on tilting the cab | ||
Note on calculation of tightening torque when using insertion or socket tools with various effective lengths | |||
| Remove | ||
1 | Start engine and bring to normal operating temperature then switch off engine | Coolant temperature approx. 70 to 95 °C. | |
2 | Switch on ignition | ||
3 | Tilt cab | ||
4 | Remove soundproofing | ||
5 | Remove air intake duct with resonator (0.2) on air compressor (1) | This ensures that the air compressor (1) suctions only oil-free air. | |
6 | Remove air line (2.1) on fitting (2) | ||
7 | Remove control line from air compressor (1) | Only for vehicles which are fitted with a air compressor (1) with control line. | |
By taking this measure one can ensure that the air compressor (1) is also in the delivery phase if the output of the compressor is impaired by another defective, for example on the pressure regulator. | |||
8 | Prepare test sheet (11) for the oil ejection check on the air compressor (1) | ||
| Test sheet for the oil expulsion test at the compressor | ||
9 | Attach test compressed air hose (2.2) for the oil ejection test equipment (3) to fitting (2) on the air compressor (1) | Adapter | |
10 | Fasten the oil ejection test equipment (3) using a cable tie (8) to a suitably stable point on the vehicle | ||
11 | Attach test kit (7) with a measuring hose (5) to oil ejection test equipment (3) | Test kit | |
12 | Fully open the compressed air outlet (10) of the oil ejection test equipment (3) by turning the adjustment lever (9) | | |
13 | Start engine and increase the rpm from idle speed to the maximum governed rpm with the engine start and engine stop button, added | ||
| Check | ||
14 | Close adjustment lever (9) until the set required back pressure is readable on the pressure gauge (6) | | |
Oil ejection test (with oil ejection test equipment and test kit) | |||
15 | Check air compressor (1) with the prepared test sheet (11) for oil ejection | | |
While the engine runs with maximum governed rpm, hold the test sheet (11) at a 10 cm distance in front of the compressed air output (10). | |||
Oil ejection test (with oil ejection test equipment and test kit) | |||
16 | Turn off engine | ||
17 | Compare the test sheet (11) with the diagnostic findings for oil ejection to assess the oil ejection | If the oil ejection is too high. | |
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Replace air compressor (1). | |||
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Vehicles with code MY2 (Air compressor, 2 cylinder, two stage) | |||
18 | Remove oil ejection test equipment (3) and test kit (7) at air compressor (1) | ||
19 | Inspect compressed-air line (2.1) for carbonization | If compressed-air line (2.1) carbonized. | |
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Replace compressed-air line (2.1). In addition, check compressed-air line between air compressor (1), compressed air drier and 4-circuit protection valve/electronic air-processing unit (EAPU). | |||
If the compressed-air lines between air compressor (1), compressed air drier and 4-circuit protection valve/electronic air-processing unit (EAPU) are carbonized. | |||
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Replace respective compressed-air line. | |||
| Install | ||
20 | Attach air line (2.1) to fitting (2) | Union nut, compressed air line to fitting | |
21 | Attach control line from air compressor (1) | Only for vehicles which are fitted with a air compressor (1) with control line. | |
Banjo bolt, control line to compressor | |||
22 | Attach air intake duct with resonator (0.2) on air compressor (1) | ||
23 | Start engine and run at idling speed | ||
24 | Check line interfaces on the air compressor (1) for leaktightness | Visual inspection. | |
25 | Turn off engine | ||
26 | Install soundproofing | ||
27 | Tilt back cab | ||
28 | 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 air 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-1003-01L | Oil ejection test (with oil ejection test equipment and test kit) | Back pressure to be set | bar | 5 | 5 |
Test duration | min | 1 | 1 |
360 589 00 21 00
Test kit
000 589 03 90 00
Adapter