june2021 - 23

and AMTs provide different warnings, so
it is important to be well versed in both.
" With manual transmissions, drivers
experience a loss of 'feel' in the clutch
pedal or may hear grinding and experience
problems completing the gear
shift, " Agebrand said.
Toninato noted slippage can be another
obvious indicator of a clutch issue,
while Copeland said drivers should be
aware of the clutch's heat - a factor that
can often be made apparent by a burning
smell, which applies to both manual
transmissions and AMTs.
Copeland also noted that most AMTs
are equipped with a clutch temperature
sensor that will notify the driver when
the clutch is too hot for safe operation.
Additionally, if the transmission fails to
shift into a gear smoothly when driving,
it is a likely indicator of a clutch issue.
" AMTs provide warnings through fault
codes and alerts to the driver to indicate
the need to stop and inspect the clutch, "
Parsons added.
She noted if the driver receives a
warning or alert while operating the
vehicle, the driver should stop the vehicle
to inspect the clutch.
Diagnosis and repair
Diagnosing clutch issues can also vary
somewhat between manual transmissions
and AMTs. For manual transmissions,
clutch pedal feel and visual
inspection are the main diagnostic methods.
AMTs, with their additional sensors,
will typically offer alerts and fault codes
and can be more readily diagnosed with
a diagnostic scan tool and software.
When it comes to repair, it is imperative
to use high quality replacement
parts for both transmission types. While
manufacturers tend to recommend OEM
brand parts, fleets are strongly advised to
at least use OEM-approved parts.
" Detroit strongly recommends using
factory-approved parts for all service and
maintenance on our products, " Copeland
said. " Factory-approved parts are typically
the same parts that were installed in
the initial build of the component. This
means the parts have the same stringent
testing and quality assurance controls as
our factory built parts. "
" You get what you pay for, " Toninato
added. Higher priced parts tend to
provide better materials and better
warranty coverage, making it worth
spending extra up front to avoid potential
issues in the future.
For AMTs, it is extremely important
to use a clutch that has been integrated
with the system to ensure performance,
Parsons said. This can be seen in terms of
driveability, noise, vibration, and harshness
(NVH), comfort, and clutch life.
She added that for manual transmissions,
using the correct clutch for
the application ensures long life, optimal
driveability and performance, and
smooth engagement.
" For both applications, if the correct
clutch is not used the overall driveline is
at risk due to excessive torsional vibrations, "
Parsons said. " This means the overall
life of the driveline would be at risk. "
Best practices for
clutch maintenance
Clutch issues can be avoided, for the
most part, by implementing proper
preventive maintenance practices. In all
cases, it is crucial to follow manufacturer
recommended maintenance intervals.
" First and foremost, always follow all
published maintenance intervals for
your transmission, " Copeland stressed.
" Periodically review all operating parameters
of a few units within your fleet to
help tailor your maintenance intervals
to your vehicle operations. Clutches need
adjustments as they wear; some clutches
require manual adjustments as they wear,
and others have self-adjusting clutches. "
The self-adjusting function - in transmissions
equipped with that feature -
allows the clutch to always remain in
prime adjustment, he added.
In addition to regular adjustment,
clutches require regular lubrication.
" For both types of clutches, fleets need
to maintain proper lubrication of the
release system to avoid release bearing
wear, " Parsons explained.
Finally, both types of transmissions
require the transmission fluid to be
changed at regular intervals. Again,
fleets should refer to the transmission
manual for recommended intervals.
While the component is designed
to wear and may eventually require
replacement, following these best practices
can help fleets get the maximum
life from their manual transmission and
AMT clutches.
For related content, visit:
FleetMaintenance.com/in-the-bay
FleetMaintenance.com/Inquire
June 2021 | FleetMaintenance.com
23
ยป Today, AMTs are spec'd on the majority of new commercial
vehicles rolling off the factory line. Despite this trend, however,
manual transmission trucks are still desirable to many fleets.
Photo courtesy of Rihm Kenworth
http://www.eberspaecher-na.com http://www.FleetMaintenance.com/in-the-bay http://www.FleetMaintenance.com/Inquire http://www.FleetMaintenance.com

june2021

Table of Contents for the Digital Edition of june2021

Uptime: The path to predictive maintenance
Editor's Note: Using resources wisely
Equipment: Getting to the bottom of air brake system leaks
In the Bay: Commercial vehicle clutch care
Shop Operations: How digitizing driver communication can improve maintenance
Fluid & Filtration: Why fleets shouldn't skimp on oil filters
Technology Trends: Gaining an advantage
Management: KPI fundamentals
Economic Outlook: Economic recovery update
Fleet Parts & Components
Tools & Equipment
Classifieds
Guest editorial: Benefits of remote brake system monitoring
june2021 - 1
june2021 - 2
june2021 - 3
june2021 - 4
june2021 - 5
june2021 - 6
june2021 - 7
june2021 - Uptime: The path to predictive maintenance
june2021 - 9
june2021 - Editor's Note: Using resources wisely
june2021 - 11
june2021 - Equipment: Getting to the bottom of air brake system leaks
june2021 - 13
june2021 - 14
june2021 - 15
june2021 - 16
june2021 - 17
june2021 - In the Bay: Commercial vehicle clutch care
june2021 - 19
june2021 - 20
june2021 - 21
june2021 - 22
june2021 - 23
june2021 - Shop Operations: How digitizing driver communication can improve maintenance
june2021 - 25
june2021 - 26
june2021 - 27
june2021 - 28
june2021 - 29
june2021 - 30
june2021 - 31
june2021 - 32
june2021 - 33
june2021 - Fluid & Filtration: Why fleets shouldn't skimp on oil filters
june2021 - 35
june2021 - 36
june2021 - 37
june2021 - Technology Trends: Gaining an advantage
june2021 - 39
june2021 - Management: KPI fundamentals
june2021 - Economic Outlook: Economic recovery update
june2021 - Fleet Parts & Components
june2021 - 43
june2021 - Tools & Equipment
june2021 - 45
june2021 - 46
june2021 - 47
june2021 - 48
june2021 - Classifieds
june2021 - Guest editorial: Benefits of remote brake system monitoring
june2021 - 51
june2021 - 52
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