Engine | 900.9 in model 375.1, 970, 972, 975, 976 |
Engine | 902.9 in model 375.1, 970, 972, 974, 975, 976 |
Engine | 902.9 in model 375.3, 950.5/6, 952.5/6, 953.6, 954.5 |
Engine | 902.9 in model 957 |
except code MS8 (Natural gas engine) | |
Engine | 924.9 in model 958.0, 970, 972, 974, 975, 976 |
Engine | 925.9 in model 970, 972, 974 |
Engine | 926.9 in model 950.5/6, 952.5/6, 953.6, 954.5, 957, 958.2 |
Engine | 926.9 in model 958.0 |
Danger | Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel. | No fires, sparks, open flames or smoking. Pour fuels into suitable and appropriately marked containers only. | |
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 it 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 closed and snug-fitting work clothes. Do not touch hot or rotating parts. | |
Topical note | Notes on tilting the cab | ||
Notes on possible sources of fault in the low-pressure fuel circuit | |||
| Check | ||
1 | Open maintenance flap | Model 957 only | |
2 | Tilt cab | ||
3 | Remove soundproofing on frame at the left | ||
4 | Visually check all fuel lines, fittings, screwed connections and components of the fuel system | If damaged or leaky: | |
| |||
Replace any assembly part as necessary, seal connection and tighten threaded connection using the prescribed tightening torque. | |||
5 | Clean fouled components of the fuel system on the outside | ||
6 | Open cap on fuel tank | ||
7 | Drain fuel prefilter with heated water separator and check fuel prefilter insert for contamination | With code K81(Fuel preheater with water separator) | |
If there is severe contamination: | |||
| |||
Replace fuel prefilter element. | |||
|
| ||
Model 958 | |||
8 | Check fuel pre-filter insert for soiling and clean if necessary | ||
| Model 375, 950, 952, 953, 954, 957, 970, 972, 974, 975, 976 | ||
Model 958 | |||
If there is severe contamination: | |||
| |||
Replace fuel prefilter element. | |||
9 | Check fuel filter element for soiling | If there is severe contamination: | |
| |||
Replace fuel filter. | |||
|
| ||
Model 958 | |||
10 | Start engine and bring to operating temperature | The fuel temperature in the fuel tank must be 40°C. | |
11 | Switch off ignition | ||
12 | Check fuel low-pressure circuit for leaktightness | Only if the engine starts badly. | |
Pressure drop in low-pressure fuel circuit | |||
Banjo bolt, fuel line (flame starting system) to banjo bolt and valve | |||
Nut, feed line and return line to fuel filter | |||
High-pressure hose | |||
Tester | |||
Adaptation parts | |||
13 | Measure fuel pressure downstream of fuel filter | Only for vehicles with poor engine performance. | |
If the fuel pressure falls within the tolerance range, no further checks need to be carried out on the low pressure fuel circuit. | |||
Fuel pressure downstream of fuel filter | |||
Banjo bolt, fuel line (flame starting system) to banjo bolt and valve | |||
High-pressure hose | |||
Adaptation parts | |||
Tester | |||
If the fuel pressure is too high: | |||
| |||
Measure fuel return quantity at the fuel tank. | |||
Fuel return quantity at fuel tank | |||
If the fuel pressure is too low: | |||
| |||
Measure fuel intake pressure upstream of fuel pump. | |||
Fuel suction pressure upstream of fuel pump at filter supply | |||
Nut, feed line and return line to fuel filter | |||
Tester | |||
Adaptation parts | |||
14 | Close fuel tank cap | ||
15 | Start the engine and bleed the fuel system | The fuel system is bled automatically. | |
16 | Install soundproofing on frame at the left | ||
17 | Tilt back cab | ||
18 | Close maintenance flap | Model 957 only |
123 589 04 21 18
High-pressure hose
541 589 00 91 00
Adaptation parts
617 589 04 21 00
Tester
541 589 02 21 00
Tester
Referenced documents
- ah0715n100002f Notes on possible sources of fault in the low-pressure fuel circuit
- ah6080n000301a Notes on tilting the cab
- ap4720w0730b Clean filter element of fuel prefilter
- ap4720w0780b Replace fuel filter
- ap4720w0783a Fuel prefilter with water separator - replacing filter element
- ar0715w200002j Measure fuel pressure downstream of fuel filter
- ar0715w200003j Measure fuel return quantity at the fuel tank
- ar0715w200004j Check low-pressure fuel circuit for signs of leaks
- ar0715w200005j Measure fuel intake pressure upstream of fuel pump
- as0000z000501a 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.
- as4700z000101a Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel.
- as6080z000101a Risk of injury caused by body parts being pinched or crushed as cab is tilted