T-B-32.34-84

Date:
February 11, 2014
Order No.:
T-B-32.34/84
32
Group:
SUBJECT:
MY- All, Model 166 with Code 468 Active Curve System
Check Active Curve System Hydraulic Pump
Oil spray or fouling on the ACTIVE CURVE SYSTEM is
not related to leakage of the hydraulic pump.
ACTIVE CURVE SYSTEM hydraulic pumps are
currently being removed in error due to presumed
leakage. Because the ACTIVE CURVE SYSTEM is not
defective, the procedure described below must be
strictly adhered to.
All ACTIVE CURVE SYSTEM hydraulic pumps which
have been examined due to presumed leakage have
clearly proven that the hydraulic pumps were not
leaking. The escaping fluid (oil spray or fouling, see
arrow) is a mineral oil and not the Pentosin used in the
P32.34-2036-81
Figure 1. On engine 157 with the belt drive removed.
hydraulic pump! Replacement of the ACTIVE CURVE
SYSTEM hydraulic pump in this case is not permissible!
Procedure
1. Clean and dry the fouled points.
2. Apply contrasting agent to locate leakage.
3. Start engine and run for at least 15 minutes or
perform a test drive of sufficient duration to allow the oil
to reach its operating temperature. If necessary, hand
the vehicle back to the customer and recall it again later
for checks and diagnosis.
4. Locate location of oil leakage and rectify the leak.
P32.34-2037-81
Figure 2. Oil spray or fouling on the ACTIVE
CURVE SYSTEM hydraulic pump, with the pump
removed for clarity.
This bulletin has been created and maintained in accordance with MBUSA-SLP S423QH001, Document and Data Control, and
MBUSA-SLP S424HH001, Control of Records.
© 2014 Mercedes-Benz USA, LLC.
Mercedes-Benz Canada, Inc.
Dealer Workshop Services
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