SI13.25-G-0002C | Service Information: Modifications/New Features in Belt Drive | 11.5.09 |
ENGINES 904.952 ## as of 350165 in MODEL 437.420 /425 with CODE (M03) Increased engine output
ENGINES 904.953 ## as of 350165 in MODEL 437.420 /425
ENGINES 924.916 ## as of 350165 in MODEL 437.420 /425 with CODE (M04) Increased engine output
ENGINES 924.916 ## as of 350165 in MODEL 437.430 /435
ENGINES 924.916 ## as of 350165 in MODEL 437.460 /465
As part of ongoing technical developments the basic belt drive and the hydraulic pump belt drives were optimized. The individual changes, as well as the procedures in the case of repairs, are described below.
With the installation of the poly-V-belt tensioner, bear in mind the changed work instructions AR13.25-G-3200C.
The series production breakpoint for modifications to the basic belt drive applies as of engine end no. 350 165; conversion of the belt drive on hydraulic pumps applies as of engine end no.:
400 305.
-----------------------------------------------------------------------------------------
After the following repairs, erase the old SAA from the vehicle data card and replace with the new SAA.
FDOK SCREEN 1512: modifications SA
,Poly-V-belt
Poly-V-belt tensioner
Guide pulley
-----------------------------------------------------------------------------------------
1 Modifications, new features in the basic belt drive
New poly-V-belt tensioner from Gates (previously Dayco).
New alternator belt pulley dia. 61mm, previously
dia. 75 mm, see SI15.40-G-0002A in combination with
SM15.40-G-0003A.
New poly-V-belt (Gates) with modified length.
-----------------------------------------------------------------------------------------
Engine with air conditioning (Code F57):
New guide pulley dia. 75 mm with new poly-V-belt
(Gates).
-----------------------------------------------------------------------------------------
1.1 Repair procedure in the case of damage to the
basic belt drive
If poly-V-belt tensioner fails (Dayco):
Installation of new poly V-belt tensioner (Gates), and, on engines with refrigerant compressor, a new guide pulley dia. 75 mm (Gates) and poly-V-belt (Gates).
If guide pulley fails (Dayco):
Installation of previous guide pulley (Dayco) with
dia. 106 mm.
If poly-V-belt fails (Dayco):
Installation of previous poly-V-belt (Dayco).
-----------------------------------------------------------------------------------------
If alternator and/or alternator belt pulley fails:
Check installed alternator belt pulley; the installed belt pulley must always have the same diameter as the removed belt pulley, see SI15.40-G-0002A in combination with SM15.40-G-0003A.
-----------------------------------------------------------------------------------------
2 Modifications, new features in the hydraulic pump belt drive
New poly-V-belt tensioner (Gates) with carrier.
New poly-V-belt (Gates) with modified length.
-----------------------------------------------------------------------------------------
2.1 Repair procedure in the case of damage to the poly-V-belt tensioner (Dayco).
If poly-V-belt tensioner fails:
Installation of the previous poly-V-belt tensioner (Dayco).
If it is necessary to exchange the poly-V-belt (Dayco) for the poly-V-belt (Gates), the matching carrier must be installed. Otherwise damage may occur in the belt drive.
-----------------------------------------------------------------------------------------
G13.20-3121-02
Poly-V-belt routing diagram
(Engine 904.952/953, 924.916.)
A Basic belt drive
1 Poly-V-belt tensioner
2 Pulley
G2 Generator
B Hydraulic pump belt drive
1 Poly-V-belt tensioner
2 Pulley
3 Carrier
G13.20-3122-02
| Remove/install | ||
1 | Remove/install poly-V belt tensioning device | Note different installation instructions. |
Parts overview / Basic belt drive
Engine: 904.952/953 | Parts | Series production, previously (Dayco) Using alternator belt pulley dia. 75 mm SA no. | Series production, new (Gates) Using alternator belt pulley dia. 61 mm SA no. |
Alternator belt pulley | 505.022/32 505.022/33 | 505.022/61 505.022/62 | |
Screw | M1090 EN 912 | M1090 MBN 10142 | |
Poly-V-belt tensioner | Z 505.072/01 | Z 505.072/31 | |
Pulley | Z 505.072/10 | Z 505.072/25 | |
Poly-V-belt | Z 505.031/03 (length 1420 mm) Without air conditioner compressor Z 505.031/05 (Length 2040 mm) With air conditioner compressor | Z505.031/77 (Length 1369 mm) Without air conditioner compressor Z 505.031/05 (Length 1939 mm) With air conditioner compressor |
Parts overview / Scope of modifications to basic belt drive
Engine: 904.952/953 | Parts | Scope of conversion for poly-V belt tensioner (Dayco to Gates) |
Screw | M1090 MBN 10142 | |
Poly-V-belt tensioner | Z 505.072/31 (Gates) | |
Pulley (with air conditioner compressor) | Z 505.072/25 = dia. 75 mm (Gates) | |
Poly-V-belt | Z 599.031/03 for alternator belt pulley dia. 75 mm Length 1390 mm (without air conditioner compressor) or Z 599.031/05 for alternator belt pulley dia. 75 mm + guide pulley dia. 75 mm (Gates) Length 1955 mm (with air conditioner compressor) |
Parts overview / Guide pulley replacement
Engine: 904.952/953 | Parts | Replacement guide pulley (Dayco) SA no. |
Pulley (with air conditioner compressor) | Z 505.072/10 = dia. 106 mm (Dayco) | |
Poly-V-belt | For alternator belt pulley dia. 75 mm + guide pulley dia. 106 mm (Dayco) or |
Conversion overview / Hydraulic pump belt drive
Engine | Parts | Previous series (Dayco) SA no. | Series production/replacement parts scope, new (Gates) SA no. |
Screw | M1065 DIN 912 | M1080 MBN 10105 | |
Poly-V-belt tensioner | Z 522.068/14 | Z 505.072/45 | |
Hydraulic pump carrier | Z 505.43/44 | Z 505.043/80 | |
Poly-V-belt | Z 505.031/31 (Length 1220 mm) (up to engine no. 400 304) | Z 505.031/97 or Z505.079/02 (Length 1205 mm) (as of engine end no. 400 305) |