Tiffin Motorhomes PowerGlide 2020 User manual

ALLEGRO RED-340 POWERGLIDE CHASSIS MANUAL
TIFFIN MOTORHOMES, INC.
105 2nd Street NW Red Bay, Alabama 35582 U.S.A.
2020PowerGlide®
Owner’s Manual
WARNING: Breathing diesel engine exhaust exposes you to chemicals known to
the State of California to cause cancer and birth defects or other reproductive harm.
•Always start and operate the engine in a well-ventilated area.
•If in an enclosed area, vent the exhaust to the outside.
•Do not modify or tamper with the exhaust system.
•Do not idle the engine except as necessary.
For more information go to www.P65warnings.ca.gov/diesel.

ALLEGRO RED-340 POWERGLIDE CHASSIS MANUAL
TIFFIN MOTORHOMES, INC.
Red 340 Chassis Owner’s Manual
Tiffin Motorhomes, Inc.
105 2nd Street NW, Red Bay, AL 35582 U.S.A.
Telephone [phone] • Facsimile 256.356.8219
E-Mail: [e-mail]
Copyright © 2019 by Tiffin Motorhomes, Inc. -- all rights reserved
Printed in the United States of America: Sixth U.S. Printing: March, 2019
[20190301]
DISCLAIMER
Many of the features and appliances described in this manual may or may not be reflected in the
actual motor home purchased, depending on the options and models selected by the motorhome
owner. All items, materials, instructions, and guidance described in this manual are as accurate
as possible at the time of printing. However, because of Tiffin Motorhomes’ ongoing and dedicated
commitment to excellence, improvement of Tiffin motorhomes is a continuing process.
Consequently, Tiffin Motorhomes reserves the right to make substitutions and improvements in its
makes and models of motorhomes without prior notification. Substitutions of comparable or better
materials, finishes, appliances, instrumentation, and instruction may be made at any time it is
deemed prudent to provide the customer with the best possible motorhome meeting the customer’s
requirements.

ii
Allegro Red 340 Tiffin PowerGlide Chassis
Customer Support
256-356-0261
Monday-Friday
6 a.m. - 4:30 p.m. CST
If you should require chassis service, you should first contact your nearest Tiffin
Powerglide®Chassis service center. If for some reason this is not possible or if you
would like to call the manufacturers direct, you can contact them at the following
telephone numbers:
TIFFIN POWERGLIDE CHASSIS
256-356-0261
(Please have your VIN# ready)
COACH-NET
(Nights and weekends)
1-866-590-5937
CUMMINS ENGINE COMPANY
1-800-DIESELS (800-343-7357)
ALLISON TRANSMISSIONS
1-800-524-2303
MICHELIN TIRE
800-TIRE-HELP (800-847-3435)
Visit our website at www.tiffinmotorhomes.com

ALLEGRO RED-340 POWERGLIDE CHASSIS MANUAL
ii
Table of Contents
Chapter 1
Tire Care
Tire Care 1-2
Correct Tire Pressure 1-3
Chapter 2
Allison Transmission Operation
Driving Considerations 2-2
Fluid Level Check 2-4
Chapter 3
Brake System
Brake System 3-2
Compressed Air System 3-4
Air Dryer 3-6
Engine Brake 3-7
Chapter 4
Cummins Engine
EPA Mandates 4-3
ATS Warning Lamps 4-4
DPF Maintenance 4-4
Aftertreatment Operation 4-5
Engine Indicator Lamps 4-7
Engine Starting 4-11
Cold-Weather Starting 4-12
Engine Braking (optional) 4-12
Cruise Control 4-13
Engine Shutdown 4-14
Diagnostic Fault Codes 4-15
Towing Hitch 4-15
Chapter 5
Scheduled Maintenance
Scheduled Maintenance Chart 5-2
Fluids 5-5
Lubrication Points 5-8
Maintenance Parts 5-13
Tiffin Assistance 5-14
Chapter 6
Pre-Trip Inspection
Pre-Trip Inspection 6-2
Chapter 7
Instruments & Controls
Tiffin Instrument Panel 7-2
Driver’s Information Center 7-5
Trip Reset and Average Fuel Economy 7-9
Modes of Operation 7-10
Chapter 8
Air Supply
Air Supply 8-2

ALLEGRO RED-340 POWERGLIDE CHASSIS MANUAL
iii
Chapter 9
Warranty
Chassis Warranties 10-2
Chapter 10
Allegro Club
Allegro Club Information 11-2

TIRE CARE
1-1
TIRE CARE
Chapter
1

TIRE CARE
1-2
Tiffin Motorhomes: “Wherever you go…we go”
Tire Care
Maintaining the proper tire inflation pressure is the most important thing you can do to maximize the life of your
tires. An under-inflated tire can build up excessive heat that may go beyond the prescribed limits of endurance of
the rubber and the radial cords. Over-inflation will reduce the tire’s footprint on the road, reducing the traction,
braking capacity, and handling of your vehicle. An over-inflated tire will also cause a harsh ride, uneven tire wear,
and will be more susceptible to impact damage.
Keep in mind that the pressure rating on the side wall of your tire is the maximum pressure for that tire. This is
not necessarily the correct pressure for the tires when installed on your vehicle. Maintaining the correct tire pressure
for your vehicle’s loaded weight is extremely important and must be a part of regular vehicle maintenance.
TIRE CARE
•What is the most important component of tire care?
TIRE PRESSURE
oWhy?
Improved Ride
Improved Tire Wear
Improved Road Handling
Improved Braking

TIRE CARE
1-3
Correct Tire Pressure
•How to determine the correct pressure
Weigh each wheel position
Set tire pressure according to chart
* This Chart Shows Cold Inflation Pressures
PSI=>
70
75
80
85
90
95
100
105
110
Max
Load per
Tire
KPA=>
480
520
550
590
620
660
690
720
760
Single LBS 3,875 4,070 4,300 4,440 4,620 4,805 4,975 5,150 5,205 5,205
Dual LBS 7,050 7410 7,720 8,080 8,410 8,820 9,050 9,370 9,610 4,805
Single KG 1,760 1,850 1,950 2,010 2,100 2,180 2,260 2,340 2,360 2,360
Dual KG 3,200 3,360 3,500 3,660 3,820 4,000 4,100 4,260 4,360 2,180
255/80 R22.5 LRG - XRV
Load per Wheel-end
22.5 X 9.00” Wheel

TIRE CARE
1-4
To determine the correct air pressure for your tires, load your motor home as you would normally travel, including
water and fuel. Go to a truck scale as found at most major truck stops and weigh each wheel position
independently, with driver and passenger(s) in the vehicle as described in the Michelin Recreational Vehicle
Tire Guide (MWL43146 Rev. 03/12) to determine the correct air pressure for the weight on each wheel position.
Then use the charts in the guide and adjust the pressure accordingly when the tires are cool or have not been
driven for more than one mile. You may call 1-800-847-3435 for a copy of the Michelin Recreational Vehicle
Tire Guide .
NOTE: Never reduce the air pressure in a hot tire.
REMEMBER: For control of your RV, it is critical that the tire pressure be the same on both sides of the axle.
Emissions and Fuel Efficiency
Compliance
Your chassis was designed, and built, with components including, but not limited to, low rolling resistance tires
specifically designed and manufactured to exacting standards for regulatory fuel efficiency and greenhouse gas
emissions compliance. The vehicle owner is responsible for being sure these components are replaced with
the same or equivalent components that maintain compliance with federal and local regulations.
For help with determining tires that are the same or equal in regards to rolling resistance for maintaining
compliance with the regulatory standards, please contact Michelin at 1-800-947-3435.