AR07.15-W-8950JB | Remove MR/PLD unit pump, install | 1.7.10 |
ENGINE 902.9 in MODEL 957 except CODE (MS8) Natural gas engine
ENGINE 926.9 in MODEL 957
W07.15-1454-08
1 Injection line
2 Fastening strip
3 Engine wiring harness
4 Screw
5 Impact extractor
6 Roller tappet
Y8 Cylinder 3 unit pump
Y9 Cylinder 4 unit pump
Y10 Cylinder 5 plug-in pump
Y11 Cylinder 6 plug-in pump
S10 Start engine button
S11 Stop engine button
Y6 Cylinder 1 unit pump
Y7 Cylinder 2 unit pump
| Removing | ||
Danger! | Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel and risk of injury to eyes and skin caused by contact with fuel | No fire, sparks, open flames or smoking. Wear protective clothing when handling fuel. | |
1 | Switch off ignition | ||
2 | Open maintenance flap | ||
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. | |
3 | Tilt cab | ||
| Notes on tilting the cab | ||
4 | Remove soundproofing on frame at upper left | ||
5 | Remove engine panel | ||
6 | Remove injection line (1) for the corresponding unit pump | | |
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7 | Mark the unit pumps relative to the cylinder concerned or note down the barcode | Only when removing several unit pumps | |
8 | Disconnect electrical engine wiring harness (3) on the corresponding unit pump | ||
9 | Disconnect the engine electrical wiring harness (3) from engine start button (S10) and engine stop button (S11) | Only if cylinder 3 unit pump(Y8), cylinder 4 unit pump (Y9) or cylinder 5 unit pump (Y10) is being removed. | |
10 | Detach mounting strip (2) from the cylinder crankcase and press off | Only if cylinder 3 unit pump(Y8), cylinder 4 unit pump (Y9) or cylinder 5 unit pump (Y10) is being removed. | |
11 | Loosen bolts (4) on the related unit pump and unscrew by about 4 to 5 mm | The unit pump is under spring force and can suddenly spring out of the crankcase if the bolts (4) are unscrewed completely and get damaged. | |
12 | Attach the impact extractor (5) to the related unit pump and pull out the unit pump with impact extractor (5) up to the heads of bolts (4). | Only in the case of a jammed unit pump. | |
If the unit pump is stuck, it should not be pushed out at the solenoid valve or housing flange, otherwise the solenoid valve will be damaged. | |||
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13 | Remove impact extractor (5) | Only if the unit pump is stuck. | |
14 | Undo bolts (4) and pull out the respective unit pumps | ||
15 | Check roller tappet (6) at respective unit pump | Inspect surface of the roller tappet; if there are only minimal scores or scratches, the MR/PLD unit pump (6) can still be used. If deep scoring, scratches or sanding spots are present: | |
Replace relevant unit pump and also check unit pump lobes on the camshaft by visual inspection. | |||
| Install | ||
16 | Carefully remove dirt and paint residues on the crankcase sealing surface | Seal off hole in crankcase. | |
17 | Replace O-rings on the unit pump | Only if reinstalling a used unit pump. | |
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Lubricate the O-rings with high-temperature grease. | |||
18 | Lubricate the unit pump body and the hole in the cylinder crankcase with high-temperature grease | ||
19 | Insert unit pump in cylinder crankcase and tighten evenly | Note the marking or barcode on the unit pumps, if more than one unit pumps are being removed. Do not damage O-rings at unit pump body. Press unit pump carefully by hand against the spring force and screw in the bolts (4) at the same time | |
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20 | Tighten the mounting strip (2) and connect engine electrical wiring harness (3) to engine start button (S10) and engine stop button (S11) | Only if cylinder 3 unit pump (Y8), cylinder 4 unit pump (Y9) or cylinder 5 unit pump (Y10) have been removed. | |
21 | Connect electrical wiring harness (3) at respective unit pump | ||
22 | Install injection line (1) for the corresponding unit pump | Check the injection lines (1) and replace if necessary. Pay attention to installation position. | |
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Danger! | Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running | Secure vehicle to prevent it from moving by itself. | |
23 | Start the engine and run it at varying speeds | Crank engine with the starter for not more than 90 seconds. The fuel system is ventilated automatically. If the engine stops or does not start, repeat starting procedure after a break of 2 minutes. | |
24 | Switch off the engine and check around the unit pumps for leaktightness | ||
25 | Connect STAR DIAGNOSIS and teach in bar code of unit pump | Only when installing new unit pumps. | |
26 | Install engine paneling | ||
27 | Install soundproofing on frame above on the left | ||
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. | |
28 | Lower cab | ||
| Notes on tilting the cab | ||
29 | Close maintenance flap |
Diesel injection system with unit pumps (MR/PLD)
Number | Designation | Engine Engine | Engine 924.9, 925.9, 926.9 | ||
BA07.15-N-1001-01A | Bolt, unit pump to crankcase | Nm | 65 | 65 | |
BA07.15-N-1004-01A | Injection line to pressure pipe connection and unit pump | Nm | 35 | 35 | |
000 589 68 03 00
Impact extractor
Box wrench bit
Ring wrench
Sleeve
000 589 07 03 00
355 589 01 63 00
904 589 03 14 00
Repair materials
Number | Designation | Order number |
BR00.45-Z-1051-06A | Hot bearing grease | A 000 989 81 51 |