Diesel engine 12V 4000 G73, 16V 4000 G73. Manual - part 33

7.17 Belt Drive

7.17.1 Drive belt – Condition check

Preconditions

☑ Engine is stopped and starting disabled.
☑ Guard is removed.

Drive belt – Condition check

Item

Findings

Action

Drive belt A

Singular cracks

None

Drive belt

Belt is oily, shows signs of over‐

heating

Replace(→ Page 136)

Drive belt B

Cracks on entire circumference

Drive belt C

Chunking

7.18 Battery-Charging Generator

7.18.1 Battery-charging generator – Check

Preconditions

☑ Engine is stopped and starting disabled.

WARNING

Compressed air

Risk of injury!

• Do not direct compressed-air jet at persons.

• Wear protective goggles / safety mask and ear protectors.

Checking battery-charging generator

Item

Findings

Measure

Ventilation area (arrow)

Clean

None

Ventilation area (arrow)

Contaminated

Clean

Cleaning battery-charging generator

Note:

Dry-clean battery-charging generator only.

1.

Remove coarse dirt from battery-charging generator.

2.

Blow out ventilation area (arrow) with compressed air until all dust is cleared.

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7.18.2 Battery-charging generator drive – Drive belt tension adjustment

Preconditions

☑ Engine is stopped and starting disabled.

Special tools, Material, Spare parts

Designation / Use

Part No.

Qty.

Torque wrench, 20-100 Nm

F30026582

1

Ratchet adapter

F30027340

1

WARNING

Spring/circlip/tensioning roller preload.

Risk of injury!

• Only use specified tool and equipment.

Adjusting belt tension

1.

Undo screw (arrow) and remove protective

cover (3).

2.

Slacken screws (1) and (2) by half a turn.

Result:

Belt tensioner moves against the drive belt

and tensions it.

3.

Tighten screw (2) to specified torque using a torque wrench.

Name

Size

Type

Lubricant

Value/Standard

Screw

M10x1.5

Tightening torque

60 Nm +5 Nm

4.

Tighten screw (1) to specified torque using a torque wrench.

Name

Size

Type

Lubricant

Value/Standard

Screw

M10x1.5

Tightening torque

42 Nm

5.

Install protective cover (3).

7.18.3 Battery-charging generator drive – Drive belt and belt tensioner replacement

Preconditions

☑ Engine is stopped and starting disabled.

Special tools, Material, Spare parts

Designation / Use

Part No.

Qty.

Torque wrench, 20-100 Nm

F30026582

1

Ratchet adapter

F30027340

1

WARNING

Heavy object.

Risk of crushing!

• Use appropriate lifting devices and appliances.

Replacing drive belt and belt

tensioner

1.

Undo screws (1), (2) and (3).

2.

Remove protective cover (8).

3.

Slacken screws (4) and (5) by half a turn.

4.

Place socket adapter or box wrench on

screw (6) and press belt tensioner in the di‐

rection indicated by the arrow as far as it

will go.

5.

Tighten screw (4).

6.

Remove drive belt (7).

7.

Screw on screw (5) and replace belt ten‐

sioner.

8.

Fit new drive belt (7).

Tensioning drive belt

1.

Slacken screw (4) by half a turn.

Result:

Belt tensioner moves against the drive belt and tensions it.

2.

Use torque wrench to tighten screw (4) to specified tightening torque.

Name

Size

Type

Lubricant

Value/Standard

Screw

M10x1.5

Tightening torque

60 Nm +5 Nm

3.

Use torque wrench to tighten screw (5) to specified tightening torque.

Name

Size

Type

Lubricant

Value/Standard

Screw

M10x1.5

Tightening torque

42 Nm

4.

Install protective cover (8).

5.

Readjust belt tension after 30 minutes and again after 8 hours engine runtime (→ Page 135).

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