Solution K11907301
Thursday, July 5, 2018 3:31:58 PM CEST

Volvo Models
Volvo Model

VNR , VNX , VNL , VNM , VHD , VAH

Engine family
Engine family

11L Engine , 13L Engine , 16L Engine

Emission Standard
Emission Standard

2018 , OBD2017 , US17 GHG , US16 , US15 , US10 , US13 OBD , US14 GHG

** SOLUTION **
Title

Volvo Chassis - Equipped With An Automated Manual Transmission Model D or F ( IShift, AMT-D, AMT-F ) - Transmission Oil Leakage From Transmission Input Shaft
Seal Or Output Shaft Seal - US10 And Newer Emissions, Common Model Years 2010
And Newer

Cause

Accumulation of debris in the left side vent ports of the tranmsission main case
(corrosion, road salt, dirt, etc) may result in oil leaks present at the transmission input
and output shaft seals.
The vent ports allow air exhausted from the shift solenoids and pistons to exit the main
case. It also allows for equalization of internal and external pressures, as heat generated
from operation will cause pressure in the case to increase. For the AMT-F this is the
only vent for the TECU and gearcase.
Blockage of these ports allows pressure to build to a point that it forces oil past the input
and output shaft seals. In extreme cases, the pressure buildup can be high enough that
operation can be affected. Excessive internal pressure caused by blocked vents may
result in slow or sluggish gear shifts.

Solution

When diagnosing and repairing a shaft seal leak:
1. Check the vent ports on the upper left side of the the main gearbox housing for any
sort of blockage or obstruction.

Clogged vent ports

2. Clean out any debris that is observed during the inspection.
3. Coat the surfaces lightly with high temperature grease. This will help prevent future
buildup or corrosion.
4. Check the tranmsission oil level in the gearbox.
- If the lube level is excessively low: Proceed to the next section.
- If the lube level is at an acceptable level: Fill the transmission oil to the correct
level and check operation.

For excessively low transmission oil levels, or customer report of noise from
the transmission:
1. The transmission will need to be inspected for internal damage. Removal may be
required for proper inspection.
NA_Sister solutions

K21250579

Solution visibility

Dealer distribution

Function(s)/component(s) affected
Function affected

automatic transmission , gear shifting , 3 1 0 TECU

Function Group
Function Group

43 gearbox

Customer effect
Main customer effect

fluid

Noise

whine

Fluid problem

leak , level incorrect

Fluid implicated

oil

Visual appearance

leaking

Conditions
Vehicle operating mode
Frequency of occurrence of
problem
Location of problem

when driving
random
underneath cab

Administration
Author

UT9268H

Dealer ID

UT9268H

Last modified by

RU4469V

Creation date

13-06-2018 20:06

Date of last update

26-06-2018 21:06

Review date

01-07-2019 00:07

Status

Published

NA_Reviewer

UT9268H

NA_Author_Group

GTT