Date code engraving location has changed beginning of 2015 (image below).
10.6. IF CLUTCH DOES NOT HAVE A DATE CODE, OR CODE FORMAT IS DIFFERENT FROM
BELOW, DO NOT REPLACE THE COIL

WB15-19E
Page 8 / 18

11. Remove the existing shaft seal drain tube and
support.
12. Reinstall on the opposite side as seen on the
image on the right.
Note: Use existing hex socket head bolt and lock
washer. Use blue Loctite 243 on threads.

13. Install new reinforcement bracket #457675 as
shown using previously removed hardware
(bolt (C) and flat washer). DO NOT tighten at
this moment.
Note: Use blue Loctite 243 on threads.

LANG clutches:
13.1. Carry on with the installation of new
reinforcement bracket #457675 as shown. Use
two “cylindrical head” socket cap screws
#5001616 (E).
Tighten to 40 lbf-ft (43 N-m)

Note: Use blue Loctite 243 on threads.

LINNIG clutches only:
13.2. Carry on with the installation of new
reinforcement bracket #457675 as shown.
13.3. Any standard bolt head would interfere
with the coil body, therefore use two button
head cap screws #502949 provided in the kit
(E).
Tighten to 32 lbf-ft (43 N-m)

Note: Use blue Loctite 243 on threads.

WB15-19E
Page 9 / 18

14. Tighten bolt in location (C).
C= 74 lbf-ft (100 N-m)
Note: If bolts are difficult to drive in hole, the
compressor may be moved. Loosen the
compressor mounting bolts (4x) at the base.
Tighten compressor mounting bolts to
74 lbf-ft. (100 N-m)

15. Reinstall tensioner, bolt and washer (B) and
bolt and nut (A). You don’t have to tighten
these bolts as the belt tension adjustment will
be done later in this procedure.

16. Apply decal #069356 were indicated on the
image.

17. Install nylon tie mount
indicated on the image.

#509815

where

WB15-19E
Page 10 / 18

18. Reinstall the electromagnetic clutch coil.
Position cable lead on the right side. Slip the
coil on the retainer on the compressor flange.
Fasten the coil with 4 screws to the
compressor.
Coil mounting screws (F): 22 lbf-ft (30 N-m).
Use blue Loctite 243.
Caution: Pay attention to the precise seat of
the coil. A non-observance may cause the
destruction of the clutch components during
operation.

19. Mount the clutch on the shaft end.
The flange and the shaft end of the
compressor must be free from dirt. Apply high
temperature approved assembly grease on the
shaft end for easy dismounting of the clutch.
Lang recommends the use of Molykote Grapid-plus or Molykote P 40.
20. Carefully mount the rotor on the shaft end by
hand.
Never use a hammer for pressing the rotor on.
To avoid damaging the bore of the rotor, feel
the engagement of the key in the keyway and
slip the rotor on the shaft end of the
compressor till reaching the stop.
The Woodruff key on the shaft end and the
groove in the location hole of the rotor must be
flush.
21. Fasten the rotor to the shaft end by using the
M12 screw and by holding-up with a wrench on
the rotor.
Rotor mounting screw (G): 60 lbf-ft (81 N-m)
Use blue Loctite 243.
22. Turn rotor by hand and pay attention to the
free run and the generation of noises. In case
of grinding or similar noises, dismount the
clutch and check installation.

WB15-19E
Page 11 / 18

23. Reinstall the drive belts.
On vehicles not equipped with an auxiliary
alternator (i.e. 2 identical belts), belt tension
should be within this range:
A belt strand tension gauge is needed
90-100 lbs new belts (mean of 2 belt values)
75-85 lbs used belts (mean of 2 belt values)
On vehicles equipped with an auxiliary
alternator (i.e. 2 different belts), belt tension
should be within this range:
A belt strand tension gauge is needed
150-160 lbs new belts (mean of 2 belt values)
120-130 lbs used belts (mean of 2 belt values)
Hand- tighten bolt (B) Apply loctite on bolt (B)
Adjust belt tension using bolt (A). Use the jam
nut to prevent rotation of bolt (A). When proper
tension is achieved, tighten bolt (B) to 43 lbf-ft.
(58 N-m)

UNLOADER COIL REPLACEMENT
A new “clip-on” type unloader coil must be installed
in order to avoid unloader failure.
1. Loosen the screw securing the connector to
the coil and then unplug the connector (A).
Keep the screw and the connector rubber
gasket for later use.
2. Unscrew the aluminum cap and discard.
3. Remove the plastic capture nut and discard.
4. Remove the coil and discard
5. Keep the O-ring on the stem.

WB15-19E
Page 12 / 18

6. Install the new clip-on coil on the stem.
7. Slide the coil over the stem assembly with the
O-ring at the base of the stem.

HARNESS #069206 INSTALLATION
Skip the harness installation if a brand new harness has been installed recently while
performing WB14-06.
If you’re not installing a new harness, DO NOT throw it away. Keep it as spare part for
later use if required.
1. While proceeding with one connector at a time,
remove the existing A/C compressor harness
simultaneously as you install the new harness.
The new harness should be installed and
routed like the one being removed.
So9: A/C electromagnetic clutch
Se29: A/C pressure switch
L199: the R.H. side cylinder unloader coil
Se23: high side pressure transducer
Se24: low side pressure transducer
C228: other C228 connector half
Take special care to route the harness according to
the following figures.
Refer to best practices at the end of this document.
Prefer larger, heat resistant cable ties over small
cable ties to limit the “pinch effect”.
Secure the cable on the cable tie mounts where
applicable.

WB15-19E
Page 13 / 18

2. Install new harness 069206. Connect L199 to
the unloader coil. Tighten the screw securing
connector L199 to the coil.
3. Secure the cable on the cable tie mounts.

Electromagnetic clutch connector So9. The
clutch should be connected directly (hard
wired) to the harness without using So9.
4. Write down wire color matching then cut the
clutch connectors So9 on harness and
compressor.
5. Slip shrink tube #062490 over each wire. Slip
an additional shrink tube over cable insulation.
6. Refer to table below if required to match wire
colours. (According to VIN of vehicle).

7. According to table, splice wires with butt slice
#562228. Crimp and solder. Inspect to make
sure you have a good crimp and solder.
8. Seal each wire with shrink tube. Seal over the
two wires and cable isolation with shrink tube.
9. Attach clutch cable along bracket as shown.

WB15-19E
Page 14 / 18

ATTACH THE EXCESS LENGTH OF CABLE ALONG MAIN STRAND OF HARNESS AS SHOWN– NYLON TIES LOCATION
SHOWN BY ARROWS

ATTACH THE EXCESS LENGTH OF CABLE ALONG MAIN STRAND OF HARNESS AS SHOWN– NYLON TIES LOCATION
SHOWN BY ARROWS

WB15-19E
Page 15 / 18

SENSOR IDENTIFICATION

ATTACH THE EXCESS LENGTH OF CABLE ALONG MAIN STRAND OF HARNESS AS SHOWN– NYLON TIES LOCATION
SHOWN BY ARROWS

WB15-19E
Page 16 / 18

BEST PRACTICES FOR CABLE SECUREMENT AND ROUTING
(Source: engineering Spec 20.0)
•

Prefer larger cable ties over smaller cable ties in
your assembly to limit local pinch effect.

•

Avoid sharp edges to prevent chaffing and
abrasion.

•

Always attach over harness loom or corrugated
tubes, not on the bare cables themselves.

• No over-tightening of cable ties. (Must only prevent harness movement)

• Perform
smart
harness
routing
to prevent water intrusion in the connectors.
(nearest low point: below connector)

• Also avoid sharp edges of plastic corrugated
tubes.

• No pulling or tension on connections.

• Avoid sharp radius routing paths. (routing path
inside diameter = 2 X cable diameter)

WB15-19E
Page 17 / 18

LINNIG ELECTROMAGNETIC CLUTCH INSTALLATION/REMOVAL

WB15-19E
Page 18 / 18

PARTS / WASTE DISPOSAL
All replaced parts must be returned to Prevost according to the Return Shipping Instructions available
on https://www.prevostcar.com/content/warranty-documents for full reimbursement. A copy of the
warranty claim form must be enclosed with the shipment.
Discard waste according to applicable environmental regulations (Municipal/State[Prov.]/ Federal)

WARRANTY
This modification is covered by Prevost’s normal warranty. We will reimburse you the parts and 2 hours
(2.0h) of labor plus an additional half hour (0.5h) applicable only for the replacement of the Lang clutch
coil by #950533, upon receipt of the replaced part and a warranty claim. Please submit claim via our
Online Warranty System, available at www.prevostcar.com (under Service \ Warranty section). Use Claim
Type: “Bulletin/Recall” and select ‘’Warranty Bulletin WB15-19".

OTHER
VBC
Bulletin

N/A

Access all our Service Bulletins on

https://secureus5.volvo.com/technicalpublications/en/pub.asp

Fail Code

22.00

Defect
Code

09

Syst. Cond

B

Causal Part

950002

or scan the QR-Code with your smart phone.
E-mail us at technicalpublications_prev@volvo.com and type
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