Eaton Transmission RTO-13707MLL Service Manual
Service Manual
Fuller Heavy-Duty Transmissions
TRSM1500 EN-US
April 2013
RT-8908LL
RTO-11707LL
RTO-11708LL
RTOF-11707LL
RTOF-11708LL
RTOF-14708LL
RTX-11708LL
RTX-14708LL
RTXF-11708LL
RTXF-14708LL
RTO-11707DLL
RTO-11709MLL
RTO-11908LL
RTO-11909ALL
RTO-11909MLL
RTO-13707DLL
RTO-13707MLL
RTO-14709MLL
RTO-14908LL
RTO-14909ALL
RTO-14909MLL
RTO-16908LL
RTO-16909ALL
RTOF-11709MLL
RTOF-11908LL
RTOF-11909ALL
RTOF-11909MLL
RTOF-13707DLL
RTOF-13707MLL
RTOF-14709MLL
RTOF-14908LL
RTOF-14909ALL
RTOF-14909MLL
RTOF-16908LL
RTOF-16909ALL
RTX-11715
RTX-14715
RTXF-11715
RTXF-14715
RTXF-15715
Warnings and Precautions
Service Procedure
WARNING
!
Warnings and Precautions
Before starting a vehicle always be seated in the driver’s seat, place the transmission in neutral, set the parking brakes and
disengage the clutch.
Before working on a vehicle place the transmission in neutral, set the parking brakes and block the wheels.
Before towing the vehicle place the transmission in neutral, and lift the rear wheels off the ground, remove the axle shafts,
or disconnect the driveline to avoid damage to the transmission during towing.
The description and specifications contained in this service publication are current at the time of printing.
Eaton Corporation reserves the right to discontinue or modify its models and/or procedures and to change specifications at any
time without notice.
Any reference to brand name in this publication is made as an example of the types of tools and materials recommended for use
and should not be considered an endorsement. Equivalents may be used.
This symbol is used throughout this manual to call attention to procedures where carelessness or failure to follow
specific instructions may result in personal injury and/or component damage.
Departure from the instructions, choice of tools, materials and recommended parts mentioned in this publication may jeopardize
the personal safety of the service technican or vehicle operator.
Warning: Failure to follow indicated procedures creates a high risk of personal injury to the service technician.
Caution: Failure to follow indicated procedures may cause component damage or malfunction.
Note: Additional service information not covered in the service procedures.
Tip: Helpful removal and installation procedures to aid in the service of this unit.
Always use genuine Eaton replacement parts.
i
Introduction
Transmission Overview
Shift Bar Housing:
Shift Bar Housing:
Levers/Housings
Levers/Housings
& Isolators
& Isolators
Air System:
Roadranger® Valve
Auxiliary Section:
Combination Cylinder
Shift Bar Housing:
Shift Bar Housing Assembly
Front Section:
Clutch Housing / Case Assembly
Front Section:
Input Shaft / Drive Gear
Front Section:
Reverse Idler
Front Section:
Countershafts
Front Section:
Reverse Idler
Air System:
Air Filter/Regulator
Auxiliary Section:
Auxiliary Countershaft
Auxiliary Section:
Auxiliary Case Assy
Auxiliary Section:
Mainshaft & Synchro
Auxiliary Section:
Auxiliary Drive Gear
Front Section:
Mainshaft
Auxiliary Section:
Countershaft
Air System:
Slave Valve
ii
Table of Contents
General Information
Purpose and Scope of Manual .................................... 1
Serial Tag Information and Model Nomenclature ........ 5
Lubrication Specifications ........................................... 7
Transmission Operation ..............................................9
Tool Specifications .................................................... 13
Preventive Maintenance Inspection ........................... 17
Power Flow Diagrams ............................................... 21
Air System Overview ................................................. 35
General Troubleshooting Chart ................................. 47
Air System Troubleshooting ...................................... 50
In-Vehicle Service Procedures
Timing Procedures .................................................... 66
How to Disassemble Roadranger Valve A-4900 ........ 70
How to Assemble Roadranger Valve A-4900 ............. 72
How to Remove the Air Lines and Hoses .................. 74
How to Install the Air Lines and Hoses ...................... 76
How to Remove Compression Type Fittings .............. 78
How to Install Compression Type Fittings ................. 79
How to Remove Push-To-Connect Type Fittings ....... 80
How to Install Push-To-Connect Type Fittings .......... 81
How to Remove Rubber 1/4" Air Hoses ..................... 82
How to Install Rubber 1/4" Air Hoses ........................ 83
How to Remove the Air Filter/Regulator .................... 84
How to Install the Air Filter/Regulator ....................... 85
How to Remove a Roadranger Valve .........................86
How to Install a Roadranger Valve ............................87
How to Remove a Slave Valve ................................... 88
How to Install a Slave Valve ...................................... 89
How to Remove the
Gear Shift Lever/Remote Shift Control ............... 90
How to Install the
Gear Shift Lever/Remote Shift Control ............... 91
How to Adjust the Remote Shift Control (LRC Type) . 92
Neutral Switch Operation and Testing .......................94
How to Remove the Neutral Switch ........................... 95
How to Install the Neutral Switch .............................. 96
Reverse Switch Operation and Testing ...................... 97
How to Remove the Reverse Switch ......................... 98
How to Install the Reverse Switch ............................. 99
How to Remove the Shift Bar Housing ....................100
How to Install the Shift Bar Housing ....................... 102
How to Remove the Oil Seal -
Mechanical Speedometer ................................ 104
How to Install the Oil Seal -
Mechanical Speedometer ................................ 106
How to Remove the Oil Seal -
Magnetic Speedometer ................................... 107
How to Install the Oil Seal - Magnetic Speedometer 110
How to Remove the
Output Yoke/Companion Flange and Nut ..........112
How to Install the Output Yoke/Companion
Flange and Nut .................................................114
How to Removethe Output Yoke/
Flange and Retaining Capscrews ......................116
How to Install the Output Yoke/
Flange and Retaining Capscrews .......................117
How to Remove the Auxiliary Section in Chassis .....118
How to Install the Auxiliary Section in Chassis ........120
How to Remove the
Combination Cylinder Assembly .......................123
How to Install the Combination Cylinder Assembly .125
Transmission Overhaul
Procedures-Bench Service
How to Disassemble the Gear Shift Lever ................127
How to Assemble the Gear Shift Lever ....................129
How to Remove the Shift Bar Housing ....................131
How to Install the Shift Bar Housing ........................133
How to Disassemble the
Standard Shift Bar Housing ..............................135
How to Assemble the Standard Shift Bar Housing ...138
How to Disassemble the Forward Shift Bar Housing 141
How to Assemble the Forward Shift Bar Housing ....144
How to Remove the Input Shaft Assembly
(without main case disassembly) ....................147
How to Install the Input Shaft Assembly
(without main case disassembly) ....................149
How to Remove the Auxiliary Section
with Tapered Bearings .....................................151
How to Remove the
Combination Cylinder Assembly .......................153
How to Remove the
Auxiliary Countershaft Assembly ......................155
How to Disassemble the Output Shaft Assembly .....158
How to Disassemble the Synchronizer Assembly ....162
How to Assemble the Synchronizer Assembly .........163
How to Assemble the Output Shaft Assembly ..........165
How to Install the Combination Cylinder Assembly .171
How to Install the Auxiliary Countershaft Assembly 173
How to Remove the Clutch Housing ........................177
How to Remove the Auxiliary Drive Gear Assembly .179
How to Disassemble the
Upper Reverse Idler Gear Assembly ................182
How to Disassemble the
Lower Reverse Idler Gear Assembly ................184
How to Remove the
Upper and Lower Countershaft Bearings ..........185
iii
Table of Contents
How to Remove the Mainshaft Assembly ................ 187
How to Remove the Countershaft Assemblies ........ 188
How to Disassemble the Countershaft Assemblies . 190
How to Remove the
Input Shaft and Main Drive Gear ...................... 192
How to Disassemble the Mainshaft Assembly ......... 195
How to Disassemble the Mainshaft Assembly
with Low Force Gearing ................................... 197
How to Assemble the Mainshaft Assembly
with Selective (Adjustable) Thickness Tolerance
Washers ........................................................... 199
How to Assemble the Mainshaft Assembly
with Non-Selective (Non-Adjustable) Tolerance
Washers ........................................................... 205
How to Assemble the Mainshaft Assembly
with Low Force Gearing ................................... 208
How to Prepare the Main Case for Assembly .......... 211
How to Assemble the Countershaft Assemblies ...... 212
How to Assemble the
Lower Reverse Idler Gear Assembly ............... 214
How to Install Countershaft Assemblies .................. 217
How to Install the Lower Countershaft Bearings ..... 218
How to Install the
Input Shaft and Main Drive Gear ...................... 220
How to Install the Mainshaft Assembly ................... 222
How to Install the Upper Countershaft Bearings ..... 224
How to Assemble the
Upper Reverse Idler Gear Assembly ................ 227
How to Install the Auxiliary Drive Gear Assembly .... 230
How to Install the Clutch Housing ...........................233
How to Disassemble the Integral Oil Pump
without Auxiliary Oil Tube ............................... 234
How to Assemble the Integral Oil Pump
without Auxiliary Oil Tube ............................... 237
How to Remove the Integral Oil Pump .................... 240
How to Install the Integral Oil Pump ....................... 242
How to Install the Auxiliary Section
with Tapered Bearings .................................... 244
Shim Procedure without a Shim Tool
for Tapered Bearings ...................................... 246
iv
Introduction
General Information
Purpose and Scope of Manual
This manual is designed to provide information necessary to service and repair the Fuller® transmissions listed on the front.
How to use this Manual
The service procedures have been divided into two sections: In-Vehicle Service Procedures and Transmission Overhaul Procedures—Bench Service. In-Vehicle Service Procedures contain procedures that can be performed while the transmission is still
installed in the vehicle. Transmission Overhaul Procedures contain procedures that are performed after the transmission has been
removed from the vehicle.
The procedure sections are laid out with a general heading at the top outside edge of each page followed by more specific headings
and the procedures. To find the information you need in these sections, first go to the section that contains the procedure you
need. Then look at the heading at the top and outside edge of each page until you find the one that contains the procedure you need.
Transmission Overhaul Procedures follow the general steps for complete disassembly and then assembly of the transmission.
Note: In some instances the transmission appearance may be different from the illustrations, but the procedure is the same.
Disassemble Precautions
It is assumed in the detailed assembly instructions that the lubricant has been drained from the transmission, the necessary linkage and vehicle air lines disconnected and the transmission has been removed from vehicle chassis. Removal of the gear shift
lever housing assembly (or remote control assembly) is included in the detailed instructions (How to Remove the Gear Shift Lever). This assembly MUST be detached from the shift bar housing before the transmission can be removed.
Follow closely each procedure in the detailed instructions, make use of the text, illustrations, and photographs provided.
Assemblies
• When disassembling the various assemblies, such as the mainshaft, countershafts, and shift bar housing, lay all parts
on a clean bench in the same sequence as removed. This procedure will simplify assembly and reduce the possibility of
losing parts.
Bearings
• Carefully wash and lubricate all usable bearings as removed and protectively wrap until ready for use. Remove bearings
planned to be reused with pullers designed for this purpose.
Cleanliness
• Provide a clean place to work. It is important that no dirt or foreign material enters the unit during repairs. Dirt is an
abrasive and can damage bearings. It is always a good practice to clean the outside of the unit before starting the planned
disassembly.
Input Shaft
• The input shaft can be removed from the transmission without removing the countershafts, mainshaft, or main drive
gear. Special procedures are required and provided in this manual.
1
For parts or service call us
Pro Gear & Transmission, Inc.
1 (877) 776-4600
(407) 872-1901
parts@eprogear.com
906 W. Gore St.
Orlando, FL 32805
Introduction
Snap Rings
• Remove snap rings with pliers designed for this purpose. Snap rings removed in this manner can be reused, if they are
not sprung or loose.
When Using Tools to Move Parts
• Always apply force to shafts, housings, etc., with restraint. Movement of some parts is restricted. Never apply force to
driven parts after they stop solidly. The use of soft hammers, soft bars, and mauls for all disassembly work is recom-
mended.
Inspection Precautions
Before assembling the transmission, check each part carefully for abnormal or excessive wear and damage to determine reuse or
replacement. When replacement is necessary, use only genuine Fuller
extended life from your unit.
Since the cost of a new part is generally a small fraction of the total cost of downtime and labor, avoid reusing a questionable part
which could lead to additional repairs and expense soon after assembly. To aid in determining the reuse or replacement of any
transmission part, consideration should also be given to the unit's history, mileage, application, etc.
Recommended inspection procedures are provided in the following checklist.
Bearings
• Wash all bearings in clean solvent. Check balls, rollers, and raceways for pitting, discoloration, and spalled areas. Re-
place bearings that are pitted, discolored, spalled, or damaged during disassembly.
• Lubricate bearings that are not pitted, discolored, or spalled and check for axial and radial clearances.
• Replace bearings with excessive clearances.
• Check bearing fit. Bearing inner races should be tight to shaft; outer races slightly tight to slightly loose in case bore. If
the bearing spins freely in the bore the case should be replaced.
Bearing Covers
• Check covers for wear from thrust of adjacent bearing. Replace covers damaged from thrust of bearing outer race.
• Check cover bores for wear. Replace those worn or oversized.
Clutch Release Parts
®
Transmission parts to assure continued performance and
• Check clutch release parts. Replace yokes worn at cam surfaces and bearing carrier worn at contact pads.
• Check pedal shafts. Replace those worn at bushing surfaces.
Gears
• Check gear teeth for frosting and pitting. Frosting of gear teeth faces presents no threat of transmission failure. Often
in continued operation of the unit, frosted gears "heal" and do not progress to the pitting stage. In most cases, gears
with light to moderate pitted teeth have considerable gear life remaining and can be reused, but gears in the advanced
stage of pitting should be replaced.
• Check for gears with clutching teeth abnormally worn, tapered, or reduced in length from clashing during shifting. Re-
place gears found in any of these conditions.
• Check axial clearance of gears.
2
Introduction
General Information
Gear Shift Lever Housing Assembly
• Check spring tension on shift lever. Replace tension spring if lever moves too freely.
• If housing is disassembled, check gear shift lever bottom end and shift finger assembly for wear. Replace both gears if
excessively worn.
Gray Iron Parts
• Check all gray iron parts for cracks and breaks. Replace parts found to be damaged.
Oil Return Threads and Seals
• Check oil return threads on the input shaft. If return action of threads has been destroyed, replace the input shaft.
• Check oil seal in rear bearing cover. If sealing action of lip has been destroyed, replace seal.
O-Rings
• Check all o-rings for cracks or distortion. Replace if worn.
Reverse Idler Gear Assemblies
• Check for excessive wear from action of roller bearings.
Shift Bar Housing Assembly
• Check for wear on shift yokes and block at pads and lever slot. Replace excessively worn parts.
• Check yokes for correct alignment. Replace sprung yokes.
• Check lock screw in yoke and blocks. Tighten and rewire those found loose.
• If housing has been disassembled, check neutral notches of shift bars for wear from interlock balls.
Sliding Clutches
• Check all shift yokes and yoke slots in sliding clutches for extreme wear or discoloration from heat.
• Check engaging teeth of sliding clutches for partial engagement pattern.
Splines
• Check splines on all shafts for abnormal wear. If sliding clutch gears, companion flange, or clutch hub has wear marks
in the spline sides, replace the specific shaft effected.
Synchronizer Assembly
• Check synchronizer for burrs, uneven and excessive wear at contact surface, and metal particles.
• Check blocker pins for excessive wear or looseness.
• Check synchronizer contact surfaces on the synchronizer cups for wear.
Washers
• Check surfaces of all washers. Washers scored or reduced in thickness should be replaced.
3
Introduction
IMPORTANT
Assembly Precautions
Make sure that case interiors and housings are clean. It is important that dirt and other foreign materials are kept out of the transmission during assembly. Dirt is an abrasive and can damage polished surfaces of bearings and washers. Use certain precautions, as listed below, during assembly.
Axial Clearances
• Maintain original axial clearances of 0.006-0.015 in. for mainshaft gears.
Bearings
• Use a flange-end bearing driver for bearing installation. These special drivers apply equal force to both bearing races,
preventing damage to balls/rollers and races while maintaining correct bearing alignment with bore and shaft. Avoid us-
ing a tubular or sleeve-type driver, whenever possible, as force is applied to only one of the bearing races.
Capscrews
®
• To prevent oil leakage and loosening, use Fuller
Gaskets
• Use new gaskets throughout the transmission as it is being rebuilt. Make sure all gaskets are installed. An omission of
any gasket can result in oil leakage or misalignment of bearing covers.
sealant #71205 on all capscrews.
Initial Lubrication
• Coat all limit washers and shaft splines with Lubricant during assembly to prevent scoring and galling of such parts.
O-Rings
• Lubricate all o-rings with silicon lubricant.
Universal Joint Companion Flange or Yoke
• Pull the companion flange or yoke tightly into place with the output shaft nut, using 650-700 lb-ft (881.28-949.07 N•m)
of torque. Make sure the speedometer drive gear or a replacement spacer of the same width has been installed. Failure
to pull the companion flange or yoke tightly into place can result in damage to the mainshaft rear bearing.
See the appropriate Illustrated Parts Lists (specified by model series) to ensure that proper parts are used during assembly of the
transmission.
4
Model Designations and Specifications
General Information
RT
O-
11909MLL
Ratio Set
Forward Speeds
6 = "Multi-Mesh" Gearing
This (x) 100 = Nominal Torque Capacity
L or LL notation used here indicates one (L)
or two Low (LL) gears in addition to designated speeds
7 = Helical Auxilary Gearing and
"Multi-Mesh" Front Gearing
9 = Improved Seal System
Eaton Fuller Model Designation Prefix
See options below:
RT Roadranger
¨
Twin Countershaft
RT
F
w/ Forward Shift Bar Housing
RTO w/ Overdrive
RTOF
w/ Overdrive and Forward Shift Bar Housing
RT
X
w/ Overdrive and Direct Shift Pattern
RTXF w/ Overdrive, Direct Shift Pattern and Forward Shift Bar Housing
Prefix
Definition
Serial Tag Information and Model Nomenclature
Transmission model designation and other transmission identification information are stamped on the transmission tag. To identify the transmission model designation and serial number, locate the tag on the transmission and then locate the numbers as
shown.
When calling for service assistance or parts, have the model and serial numbers handy.
Do not remove or destroy the transmission identification tag.
The model number gives basic information about the transmission. Use this number when calling for service assistance or replacement parts.
Serial Number
The serial number is the sequential identification number of the transmission. Before calling for service assistance, write the number down. It may be needed.
Bill of Material or Customer Number
This number may be located below the model and serial numbers. It is a reference number used by Eaton®.
5
Model Designations and Specifications
Model Options
Torque Rating
The torque rating of the transmission specified in the model number is the input torque capacity in Lb·ft. Various torque ratings
are available. For more information, call your Eaton Fuller regional sales and service office at 1-800-826-HELP (4357).
Shift Bar Housings
Two types of shift bar housings are available for this transmission. Both are described and shown below.
Standard
The standard shift bar housing has a gear shift lever opening that is located toward the rear of the transmission.
Forward
The forward shift bar housing has a gear shift lever opening located three inches closer to the transmission front than the standard
opening. This forward design allows greater flexibility in mounting the transmission and is indicated by an "F" in the model number
.
Lubrication Pumps
Internal: An internal lubrication pump is located in the lower front of the transmission and is driven off the upper coun-
tershaft. Transmissions rated 1550 Lb·ft. and above include the internal pump standard.
PTO Driven: A PTO driven pump is externally mounted on the 6 or 8 bolt PTO openings and driven off the PTO gear.
Power Take Off (PTO) Usage
PTOs can be mounted in the following way:
6 or 8 Bolt: The 6 or 8 bolt openings are standard with the transmission. The PTO is mounted to the opening and driven
from the PTO gear on the front countershaft.
Thru-Shaft: The thru-shaft PTO mounts on the rear of the transmission. It requires a special auxiliary housing and main
case countershaft with internal splines.
6
Lubrication
General Information
IMPORTANT
Lubrication Specifications
Transmission filters should be changed during regular lube intervals. Inspection of the transmission filter should be conducted during preventive maintenance checks for damage or corrosion. Replace as necessary.
®
Note: For a list of Eaton
Note: The use of lubricants not meeting these requirements will affect warranty coverage.
Note: Additives and friction modifiers must not be introduced. Never mix engine oils and gear oils in the same transmission.
Buy from a reputable dealer
For a complete list of approved and reputable dealers, write to: Eaton Corporation, Worldwide Marketing Services, P.O. Box 4013,
Kalamazoo, MI 49003,
Transmission Operating Angles
If the transmission operating angle is more than 12 degrees, improper lubrication will occur. The operating angle is the transmission mounting angle in the chassis plus the percent of upgrade (expressed in degrees). For operating angles over 12 degrees, the
transmission must be equipped with an oil pump or cooler kit to insure proper lubrication.
Approved Synthetic Lubricants, see TCMT0021 or call 1-800-826-HELP (4357).
Operating Temperatures with Oil Coolers
The transmission must not be operated consistently at temperatures above 250°F. Operation at temperatures above 250°F [121°C]
causes loaded gear tooth temperatures to exceed 350°F [177°C] which will ultimately destroy the heat treatment of the gears. If
the elevated temperature is associated with an unusual operating condition that will reoccur, a cooler should be added, or the capacity of the existing cooling system increased.
The following conditions in any combination can cause operating temperatures of over 250° F [121°C]:
• Operating consistently at slow speed.
• High ambient temperatures.
• Restricted air flow around transmission.
• Use of engine retarder.
• High horsepower operation.
Note: Transmission coolers must be used to reduce the operating temperatures when the above conditions are encountered.
7
Lubrication
Oil Cooler Chart
Table 4
TRANSMISSION OIL COOLERS ARE:
Recommended
• With engines of 350 H.P. and above.
Required
• With engines 399 H.P. and above and GCW’s over 90,000 lbs.
• With engines 399 H.P. and above and 1400 lb-ft (1898.15 N•m) or greater torque.
• With engines 1500 lb-ft (2033.73 N•m) and above
18-speed AutoShift transmissions require use of an Eaton® supplied oil-to-water cooler or approved equivalent.
• With engines 450 H.P. and above.
8
Transmission Operation and Theory
General Information
Figure 2-1. Shift Pattern Decal
1
4
7
2
5
LO
LO-LO
3
6
Eaton® Fuller¨Roadranger
¨
Transmissions
7 SPEED
+LO & LO-LO (RTO)
RANGE
SELECTOR
PRE-SELECT
(LO-LO)
ALL RANGE SHIFTS
DEEP REDUCTION
SELECTOR
(MOVE RANGE SELECTOR BEFORE MOVING SHIFT LEVER)
START WITH RANGE SELECTOR DOWN
SHIFT LO-1-2-3 RAISE RANGE SELECTOR
SHIFT 4-5-6
SHIFT 7-6-5-4 MOVE RANGE SELECTOR DOWN
SHIFT 3-2-1-LO
HI
LO
UPSHIFTING
DOWNSHIFTING
DO NOT CHANGE RANGE WHILE MOVING IN REVERSE
Neutral
20464
WARNING
!
PUT TRANSMISSION IN NEUTRAL
BEFORE STARTING ENGINE
RRR
1
5
8
2
6
LO
LO-LO
3
7
Eaton¨ Fuller¨Roadranger
¨
Transmissions
8 SPEED
+LO & LO-LO (RTO)
RANGE
SELECTOR
PRE-SELECT
(LO-LO)
ALL RANGE SHIFTS
DEEP REDUCTION
SELECTOR
(MOVE RANGE SELECTOR BEFORE MOVING SHIFT LEVER)
START WITH RANGE SELECTOR DOWN
SHIFT LO-1-2-3-4 RAISE RANGE SELECTOR
SHIFT 5-6-7-8
SHIFT 8-7-6-5- MOVE RANGE SELECTOR DOWN
SHIFT 4-3-2-1-LO
HI
LO
UPSHIFTING
DOWNSHIFTING
DO NOT CHANGE RANGE WHILE MOVING IN REVERSE
Neutral
20465
WARNING
!
PUT TRANSMISSION IN NEUTRAL
BEFORE STARTING ENGINE
RRR
4
1
5
7
3
2
6
LO
LO-LO
4
8
Eaton¨ Fuller¨Roadranger
¨
Transmissions
8 SPEED
+LO & LO-LO
RANGE
SELECTOR
PRE-SELECT
(LO-LO)
ALL RANGE SHIFTS
DEEP REDUCTION
SELECTOR
(MOVE RANGE SELECTOR BEFORE MOVING SHIFT LEVER)
START WITH RANGE SELECTOR DOWN
SHIFT LO-1-2-3-4 RAISE RANGE SELECTOR
SHIFT 5-6-7-8
SHIFT 8-7-6-5- MOVE RANGE SELECTOR DOWN
SHIFT 4-3-2-1-LO
HI
LO
UPSHIFTING
DOWNSHIFTING
DO NOT CHANGE RANGE WHILE MOVING IN REVERSE
Neutral
22466
WARNING
!
PUT TRANSMISSION IN NEUTRAL
BEFORE STARTING ENGINE
RRR
3
7
2
6
LO
4
8
Eaton¨ Fuller¨Roadranger
¨
Transmissions
9 SPEED
+LO & LO-LO
RANGE
SELECTOR
PRE-SELECT
ALL RANGE SHIFTS
DEEP REDUCTION
SELECTOR
(LO-LO)
MOVE RANGE SELECTOR BEFORE MOVING SHIFT LEVER
START WITH RANGE SELECTOR DOWN
SHIFT LO-1-2-3-4 RAISE RANGE SELECTOR
SHIFT 5-6-7-8
SHIFT 8-7-6-5 MOVE RANGE SELECTOR DOWN
SHIFT 4-3-2-1-LO
HI
LO
UPSHIFTING
DOWNSHIFTING
DO NOT CHANGE RANGE WHILE MOVING IN REVERSE
Neutral
4302441
WARNING
!
PUT TRANSMISSION IN NEUTRAL
BEFORE STARTING ENGINE
RRR 5 1
LL2
LL1
IN
OUT
2
7
9
4
385
10
Eaton¨ Fuller¨Roadranger
¨
Transmissions
15 SPEED
(RT & RTX)
RANGE
SELECTOR
PRE-SELECT
(LO-LO)
ALL RANGE SHIFTS
DEEP REDUCTION
SELECTOR
(MOVE RANGE SELECTOR
BEFORE
MOVING SHIFT LEVER)
START WITH RANGE SELECTOR DOWN
SHIFT 1-2-3-4-5 RAISE RANGE SELECTOR
SHIFT 6-7-8-9-10
SHIFT 10-9-8-7-6 MOVE RANGE SELECTOR DOWN
SHIFT 5-4-3-2-1
HI
LO
IN
OUT
UPSHIFTING
DOWNSHIFTING
DO NOT CHANGE RANGE WHILE MOVING IN REVERSE
Neutral
20468
WARNING
!
PUT TRANSMISSION IN NEUTRAL
BEFORE STARTING ENGINE
R
R
HI
LO
R
6
1
2
7
10
5
384
9
Eaton¨ Fuller¨Roadranger
¨
Transmissions
15 SPEED
(RTO)
RANGE
SELECTOR
PRE-SELECT
(LO-LO)
ALL RANGE SHIFTS
DEEP REDUCTION
SELECTOR
(MOVE RANGE SELECTOR
BEFORE
MOVING SHIFT LEVER)
START WITH RANGE SELECTOR DOWN
SHIFT 1-2-3-4-5 RAISE RANGE SELECTOR
SHIFT 6-7-8-9-10
SHIFT 10-9-8-7-6 MOVE RANGE SELECTOR DOWN
SHIFT 5-4-3-2-1
HI
LO
IN
OUT
UPSHIFTING
DOWNSHIFTING
DO NOT CHANGE RANGE WHILE MOVING IN REVERSE
Neutral
20467
WARNING
!
PUT TRANSMISSION IN NEUTRAL
BEFORE STARTING ENGINE
HI
LO
R
6
1
RTO-11707LL
RTO-11707DLL
RTO-13707MLL
RTO-13707DLL
RTO-11708LL
RTO-14708LL
RTX-11708LL
RTX-14708LL
RTO-11908LL
RTO-14908LL
RTO-16908LL
RTO-11709MLL
RTO-14709MLL
RTO-11909MLL
RTO-14909MLL
RTO-11715
RTO-14715
RTO-15715
RT-11715
RT-14715
RT-15715
RT-14915
RTX-11715
RTX-14715
RTX-15715
RTO-14915
RTO-16915
Transmission Operation
Depending on specific model, this Fuller® transmission model contains from 9 to 15 forward gear ratios and three reverse gear
ratios. The gear shift lever mechanically engages and disengages five forward gears and one reverse gear in the transmission
front section. The rear section of the transmission (auxiliary section) contains three additional gear sets which are shifted with
air. The auxiliary section provides deep reduction (low low range), low range, and high range. The driver can shift in or out of
deep reduction by moving the deep reduction button found on the shift knob side. Low and high range are shifted by moving the
range selection lever found on the shift knob front. Therefore, when a front section gear is combined with the proper auxiliary
section condition (deep reduction, low range, or high range) a corresponding forward or reverse gear ratio is obtained. See the
operating instructions and power flow charts found in this section for specific details.
Shift Patterns
A shift pattern decal that explains how to properly shift the transmission should be in your vehicle (Figure 2-1). If it has been lost,
®
a replacement may be obtained from any Eaton
parts distributor.
9
Transmission Operation and Theory
WARNING
CAUTION
Initial Start-Up
Before starting a vehicle always be seated in the driver’s seat, move the shift lever to neutral, and set the parking brakes.
Before moving a vehicle, make sure you understand the shift pattern configuration.
1. Make sure the shift lever is in neutral and the parking brakes are set.
2. Turn on the key switch, and start the engine.
3. Allow the vehicle air pressure to build to the correct level. Refer to your “Operator and Service Manual” supplied with
the truck.
4. Apply the service brakes.
5. Release the parking brakes on the vehicle.
6. Make sure the Range Selector is down in the low range position (Figure 2-2).
Range Selector MUST be
in the Low Range position
for Low Range.
Figure 2-2.
7. Depress the clutch pedal to the floor.
8. Move the shift lever to the desired initial gear.
9. Slowly release the clutch pedal and apply the accelerator.
Double-Clutching Procedure
1. Depress the pedal to disengage the clutch.
2. Move the shift lever to neutral.
3. Release the pedal to engage the clutch.*
a. Upshifts—decelerate engine until engine RPM and road speed match.
b. Downshifts—accelerate engine until engine RPM and road speed match.
4. Quickly depress the pedal to disengage the clutch and move the shift lever to the next gear speed position.
5. Release the pedal to engage the clutch.
Note: By engaging the clutch with the shift lever in the neutral position, the operator is able to control the
mainshaft gear RPM since it is regulated by engine RPM. This procedure allows the operator to
10
Transmission Operation and Theory
General Information
CAUTION
T
ransmissions
Ful e
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speed up or slow down the mainshaft gearing to properly match the desired gear speed and the
outputshaft speed.
Lever Shifts
When moving the shift lever, double-clutching is recommended.
Range Shifts
Avoid moving the Range Selector with the shift lever in neutral while the vehicle is moving.
Low range to high range
When in the last gear position for low range and ready for the next upshift, preselect by moving the
range selector lever up. The move the shift lever, double-clutch, to the next higher speed position
according to your shift pattern. As the shift lever passes through neutral, the transmission will
automatically shift from low to high range.
High range to low range
While still in gear, preselect for low by moving the range selector down. Then move the shift lever,
double-clutching, to the next desired gear position in low range. As the shift lever passes through
neutral, the transmission automatically shifts from high range to low range.
Deep Reduction Shifts
Note: Deep reduction is only available in low range.
Button back - deep reduction not selected.
¨
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Ful e
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T
ransmissions
Button forward - deep reduction selected
To obtain deep reduction (low low), first make sure range selection lever is down for low range. Then, move deep reduction button forward.
Upshifts
An upshift from deep reduction can be performed while the vehicle is moving.
If the driver is not moving the shift lever during the shift (example: RTO-14708LL) depress the clutch pedal once immediately
after moving the deep reduction button rearward. Decrease engine RPM to obtain synchronous for shift completion.
If the driver is moving the shift lever during the shift (example: RTO-14715) move the deep reduction button rearward and immediately double-clutch while moving the shift lever. Decrease engine RPM to obtain synchronous for shift completion.
11
Transmission Operation and Theory
Downshifts
Downshifts into deep reduction while moving are generally not recommended, but are possible if
operating conditions make it necessary. In this situation, complete the shift immediately after moving
the deep reduction button. Single clutch if not moving the shift lever, double-clutch if the shift lever
will be moved.
Special Notes
15 Speed Models
When upshifting from a deep reduction gear into a low range gear, it is recommended that the shift lever is moved back one gear
position during the shift out of deep reduction. For example:
If the driver is in deep reduction 5th gear position, he/she should double-clutch and move the shift lever to the 4th gear position
immediately after moving the deep reduction button. If the shift lever is not moved during this shift, the vehicle must have
enough speed to make a 42% step upshift.
4th Gear Position
R
Neutral
4
1
Low Range
5
5th Gear Position
Deep Reduction
DLL and MLL Models
The three lowest gears (LL1, LO, LL2) are used for road speed control. These shifts are not intended
to be used as progressive shifts.
Additional Operating Information
Preselect
IMPORTANT: Always preselect all range shifts when upshifting or downshifting. Preselection requires that the Range Selector is
moved to the needed position before starting the lever shift. Preselected range shifts are completed automatically as the lever is
moved through neutral and into the next gear. Preselecting all range shifts prevents damage to the transmission and provides for
smoother shifts.
Clutch Brake (Used with pull-type clutches)
The Clutch Brake is applied by fully depressing the clutch pedal to the floor board. When applied, the brake slows down and can
stop the transmission front box gearing. It is a disc-type brake incorporated into the clutch and transmission drive gear assemblies. Never use the Clutch Brake when upshifting or downshifting. Use only for initial gear engagement when the vehicle is
standing still.
Countershaft Brake (Used with push-type clutches)
The control button is mounted on the shift lever just below the shift knob. To operate the brake, disengage the clutch, press down
the control button, and shift into 1st or reverse. This is an air operated mechanical brake which slows down the transmission
gearing by forcing a piston against the countershaft PTO gear
Note: Never use the Countershaft Brake when upshifting or downshifting. Use only for initial gear engagement when the vehicle
is standing still.
12
Recommended Tools
General Information
Tool Specifications
Some repair procedures pictured in this manual show the use of specialized tools. Their actual use is recommended as they make
transmission repair easier, faster, and prevent costly damage to critical parts.
For the most part, ordinary mechanic's tools such as socket wrenches, screwdrivers, etc., and other standard shop items such as
a press, mauls and soft bars are the only tools needed to successfully disassemble and reassemble any Fuller
The following tables list and describe the typical tools required to properly service this model transmission above and beyond the
necessary basic wrenches, sockets, screwdrivers, and prybars.
®
transmission.
General Tools
The following tools are available from several tool manufacturers such as Snap-On, Mac, Craftsman, OTC, and many others.
Table 5 General Tools
TOOL PURPOSE
0-100 lb-ft 1/2” drive Torque Wrench General torquing of fasteners (Typically 15-80 lb-ft [20.34-108.47
N•m])
0-700 lb-ft 3/4” or 1" drive Torque Wrench Torquing of output nut to 650-700 lb-ft (881.28-949.07 N•m)
0-50 lb-in 3/8” drive Torque Wrench General torquing of fasteners
0-30 lb-in 1/4” drive Torque Wrench Torquing of capscrews to 7 lb-in (0.79 N•m) during auxiliary coun-
tershaft bearing endplay setting procedure
70 MM or 2 2/4" Socket - Standard Depth To remove the output shaft nut
Large Brass Drift Used to protect shafts and bearings during removal
Large Dead Blow Hammer or Maul To provide force for shaft and bearing removal
Snap Ring Pliers - Large Standard External To remove the snap rings at the auxiliary drive gear, input shaft
bearing, and countershaft bearings
Feeler Gauges To set mainshaft washer endplay and auxiliary tapered bearing
endplay
Rolling Head (Crow's Foot) Prybar To remove the auxiliary drive gear bearing
(2) Air Pressure Gauges 0-100 PSI (0-1034 kPa) To troubleshoot and verify correct operation of air system
Universal Bushing Driver To remove and install clutch housing bushings. Bushing OD =
1.125 in., ID = 1.000 in.
13
Recommended Tools
The following special tools are designed for this Fuller® transmission. The addresses and phone numbers of the tool suppliers are
listed after the table. This list is provided as a convenience to our customers. These tools are manufactured by independent companies with no relationship to Eaton. Eaton does not warrant the fit or function of the listed tools. To obtain the tools, contact the
tool supplier directly.
Table 6 Special Tools
REFERENCE
NUMBER
T1 Output Yoke Puller May be required to remove a
T2 Auxiliary Section
T3 Auxiliary Counter-
T4 Shift Lever Spring
T5 Slide Hammer To remove the output seal
TOOL PURPOSE G & W TOOL NO. GREAT LAKES
rusted output yoke.
To support, or hang, the aux-
Hanger
shaft Support and
Shim Tool
Installation Tool
(Tension Spring
Driver)
iliary section in the horizontal position.
To hold the auxiliary countershafts in position while installing the auxiliary section
in the horizontal position.
Also to simplify the checking
and setting of the auxiliary
countershaft bearing endplay.
To install the shift tower tension spring.
and reverse idler shafts. Requires 1/2"-13 threads. (Optional, idler shaft can be
driven out from front.)
OTC TOOL NO.
TOOL NO.
SP-450 7075
G-40 T-125 5061
G-250 T-311 5062
G-116 T-170
G-70 T-150 1155 Slide Ham-
mer / 8007 1/2" 13 Adapter
T6 Bearing Puller To remove front section
countershaft bearings.
T7 Bearing Driver To install front section coun-
tershaft bearings (3.97" OD,
1.78" ID).
T8 Bearing Driver To install the front counter-
shaft rear bearings (3.5" OD,
1.6" ID).
T9 Countershaft Sup-
port Tools (2)
T10 Input Bearing Driver To install input bearing on
14
To support and locate the
front section countershafts
during bearing removal and
installation.
input shaft.
G-10 or G-15 T-1 and T-2 for
9-Series
G200 Kit T-101 Kit
G200 Kit T-101 Kit
G-50 / G-51 / G58
G-35 T-120 5066 (2" shaft)
7 series T-135
9 series T-132
T-140 as an
option for front
bearing (both)
7070A Kit
7109
General Information
Table 6 Special Tools (Continued)
Recommended Tools
REFERENCE
NUMBER
T11 Bearing Puller To remove the auxiliary
T12 Bearing Driver To install the auxiliary coun-
T13 Output Seal Remov-
T14 Auxiliary Section
T15 Mainshaft Hook To assist in lifting of main-
T16 Input Bearing Puller To remove input bearing. G-38 T-3 7070A Kit
T17 Bearing Race Puller To remove the auxiliary
T18 Bearing Race In-
TOOL PURPOSE G & W TOOL NO. GREAT LAKES
TOOL NO.
4332/4232 1123 / 927
countershaft tapered bearings.
G-200 Kit T-105 Kit
tershaft tapered bearings.
To remove the output seal in
al Tool
Removal Adapter
Plate
staller
chassis. Can use slide hammer.
To attach transmission jack
to auxiliary section for auxiliary section removal in chassis.
shaft from front section.
countershaft tapered bearing
outer races.
To install the auxiliary countershaft tapered bearing outer races.
G-115 49611 (Used
G-225 T-165
OTC TOOL NO.
Use 27315 hook
with 1155 slide
hammer
with OTC transmission jack P/N
5019.)
7136 puller attached to 1155
slide hammer
27524/27530
discs used with
27488 handle
and 10020
screw.
* Tool ID numbers are referenced in the service procedures.
Special Tools
Table 7 Shop Equipment
20 Ton capacity press To press countershaft gears from countershaft.
Specialty Tool Manufacturers
Below are the addresses and phone numbers of the companies that make tools specifically for Eaton®Fuller® transmissions:
G and W Tool Company
1105 E. Louisville, Broken Arrow, OK 74012-5724, Phone: 800-247-5882, or 918-258-6881
Great Lakes Tool
8530 M-89, Richland, MI 49083, Phone: 800-877-9618, or 269-629-9628
O.T.C. 655 Eisenhower Dr., Owatonna, MN 55060-117, Phone: 800-533-6127, or 507-455-7000
The specialized tools can be obtained from a tool supplier or made from tool prints as required by the individual user. Detailed
®
Transmission Tool Prints are available upon request by writing to:
Fuller
15
Recommended Tools
Eaton Corporation, Truck Components Operations Technical Service, P.O. Box 4013, Kalamazoo, Michigan 49003
Eaton Aftermarket Parts
The following tools are available through Eaton Aftermarket Parts. To obtain any of the tools listed, contact your local Eaton parts
distributor.
Table 8
TOOL PURPOSE EATON® PART NUMBER
5/32” Air Line Release Tool To remove 5/32” air lines from push-to-
connect fittings.
Air Line Cutting Tool To cut plastic air lines smoothly and
squarely.
Output Seal Driver To install output seal. For 7 series: Eaton P/N 5564501 driver.
Output Seal Slinger Driver To install output seal slinger. For 7 series: Eaton P/N 71223.
P/N 4301157 included in kit K-2394
P/N 4301158 included in kit K-2394.
For 9 series: Use Eaton® P/N 5564509
adapter with 5564501 driver. Both parts
included in complete Eaton® seal kit P/
N TCMT0912.
For 9 series: Eaton P/N 4303829.
16
Preventive Maintenance
General Information
Preventive Maintenance Inspection
Everyday there are countless vehicles operating over the highways with transmissions in such a neglected mechanical condition,
they can be referred to as failures looking for a place to break down. They lack a proper and organized preventive maintenance
program.
Preventive maintenance is a general term which applies to all procedures necessary to have maximum life and satisfactory service
at the lowest possible cost, short of removing and repairing the unit.
A number of conditions contrary to good preventive maintenance can generally be pointed to when inspecting a failed transmission. Taking a few minutes every so many hours or miles to do a few simple checks could help avoid eventual breakdown or
reduce the repair cost. If the transmission is not cared for, it will breakdown.
Preventative Maintenance Check Points
Note: Transmission appearance may differ, however the procedure is the same.
17
Preventive Maintenance
1. Air System and Connections
• Check for leaks, worn air lines, loose connections and capscrews.
2. Clutch Housing Mounting
• Check all capscrews of clutch housing flange for looseness.
3. Clutch Release Bearing (Not Shown)
• Remove hand hole cover and check radial and axial clearance in release bearing.
• Check relative position of thrust surface of release bearing with thrust sleeve on push-type clutches.
4. Clutch Pedal Shaft and Bores
• Pry upward on shafts to check wear.
• If excessive movement is found, remove clutch release mechanism and check bushings on bores and wear on
shafts. See OEM literature.
5. Lubricant
• See Lubrication Manual TCMT0021.
6. Oil Filter
• Oil Filter Inspection (during vehicle PM schedule):
- Inspect oil filter for damage or rust. Replace as necessary.
- Inspect oil filter adapter for damage or leakage. Replace as necessary.
• Oil FIlter Replacement
- Replace every 100,000 miles and top off fluid.
- Every transmission fluid change.
7. Filler and Drain Plugs
• Remove filler plugs and check level of lubricant at specified intervals. Tighten fill and drain plugs securely.
8. Capscrews and Gaskets
• For applicable models, check all capscrews, especially those on PTO covers and rear bearing covers for looseness
which would cause oil leakage.
• Check PTO opening and rear bearing covers for oil leakage due to faulty gasket.
9. Gear Shift Lever
• Check for looseness and free play in housing. If lever is loose in housing, proceed with Check No. 10.
10. Gear Shift Lever Housing Assembly
• If present, remove air lines at air valve or slave valve. Remove the gear shift lever housing assembly from the transmission.
• Check the tension spring and washer for set and wear.
• Check the gear shift lever spade pin and slot for wear.
• Check bottom end of gear shift lever for wear and check slot of yokes and blocks in shift bar housing for wear at
contact points with shift lever.
Checks With Drive Line Dropped
11. Universal Joint Companion Flange or Shaft Nut
• Check for tightness. Tighten to recommended torque.
18
Preventive Maintenance
General Information
12. Output Shaft (Not Shown)
• Pry upward against output shaft to check radial clearance in mainshaft rear bearing.
Checks With Universal Joint Companion Flange or Yoke Removed
Note: If necessary, use solvent and shop rag to clean sealing surface of companion flange or yoke. Do not use crocus cloth, emery
paper, or other abrasive materials that will mar surface finish.
13. Splines on Output Shaft (Not Shown)
• Check for wear from movement and chucking action of the universal joint companion flange or yoke.
14. Mainshaft Rear Bearing Cover (Not Shown)
• Check oil seal for wear.
Inspection
PART TO INSPECT WHAT TO CHECK FOR ACTION TO BE DONE
Speedometer Connections Speedometer cables should not be
loose.
Should be an o-ring or gasket between
the mating speedometer sleeve and the
rear bearing cover.
Rear Bearing Cover Capscrews,
Gasket, and Nylon Collar
Output Shaft Nut Check the output shaft nut for tight-
PTO Covers and Openings Check the capscrews for tightness. Apply Eaton Sealant #71205 to the capscrew
Check retaining capscrews for tightness.
Verify nylon collar and gasket are installed at the chamfered hole, aligned
near the mechanical speedometer
opening.
Verify that a rear bearing cover gasket
is in place.
ness.
Applied hydraulic thread sealant #71208 to threads,
torque speedometer sleeve to 35-50 lb-ft (47.45-
67.79 N•m).
Replace the o-ring/gasket if damaged or missing.
Apply Eaton Sealant #71205 to the capscrew
threads, torque to 35-45 lb-ft (47.45-61.01 N•m).
Use new parts if need to replace. Apply Eaton Sealant #71205 to the capscrew threads, torque to 35-45
lb-ft (47.45-61.01 N•m).
Install a new gasket if rear bearing cover was removed.
Torque the output shaft nut to 650-700
lb-ft (881.28-949.07 N•m). Do not over torque the
output nut.
threads. Torque 6 bolt PTO capscrews to 35-45 lb-ft
(47.45-61.01 N•m), 8 bolt PTO capscrews to 50-65
lb-ft (67.79-88.13 N•m).
Gray Iron Parts Check front bearing cover, front case,
shift bar housing, rear bearing cover,
and clutch housing for cracks or
breaks.
Front Bearing Cover Check return threads for damage. If threads damaged, replace the input shaft.
Check the capscrews for tightness. Torque the capscrews to 35-45 lb-ft (47.45-61.01
Oil Cooler and Oil Filter Check all connectors, fittings, hoses,
and filter element for tightness.
Oil Drain Plug, Oil Fill Plug Check the oil drain plug and the oil fill
plug for leakage.
Replace parts found to be damaged.
N•m).
Tighten any loose fittings.
Torque the oil drain plug to 45-55 lb-ft (61.01-74.57
N•m), oil fill plug to 60-70 lb-ft (81.35-94.91 N•m).
19
Preventive Maintenance
Oil Leak Inspection Process
Inspect for Oil Leak
Determine if it is a Weep or a Leak
Weep: Stained, damp, no drips, light oil film,
dirt adhered to the contaminated area.
Gasket Rear Seal Leak
Leak: Extremely wet or dripping of oil in the
contaminated area.
Step 1
1. Clean suspected oil weep
area with a clean dry cloth
or mild soluble degreaser.
2. Ensure lube is to proper
level.
3. Notify the customer that it
is only a weep and it is not
considered to be detrimental
to the life of the transmission.
4. Repair is complete.
1. Do not repair: Rear seal is
designed to allow minimal
seepage (refer to Roadranger
TCSM-0912 Seal Maintance
Guide).
2. Ensure lube is to proper
level.
Step 2
Step 3
1. Determine the origin of the leak path.
2. If origin of leak is obvious skip to Step 3.
3. If the origin of the oil leak is not obvious then
use either of the two following steps to determine
the oil leak:
Note: Do not use a high pressure spray washer to
clean the area. Use of a high pressure spray may
force contamination into the area of concern and
temporarily disrupt the leak path.
i. Clean area with a clean dry cloth or mild
soluble degreaser and fill the transmission to
the proper lube level.
OR
ii. Clean the area as noted above and insert tracer
dye into the transmission lube and fill
transmission to proper lube level.
Operate vehicle to normal transmission operating
temperature and inspect the area for oil leak(s)
visually or if tracer dye was introduced use an UVL
(Ultraviolet Light) to detect the tracer dye’s point
of origin.
Note: When inspecting for the origin of the leak(s)
make sure the assumed leak area is not being
contaminated by a source either forward or above
the identified area such as the engine, shift tower,
shift bar housing, top mounted oil cooler, etc...
Once the origin of the leak is identified, repair the
oil leak using proper repair procedures from the
designated model service manual.
20
Step 4
After the repair is completed, verify the leak is
repaired and operate the vehicle to normal
transmission operating temperature.
Inspect repaired area to ensure oil leak has been
eliminated. If the leak(s) still occurs, repeat steps
or contact the Roadranger Call Center at
1-800-826-4357.
Power Flow
General Information
Sliding Clutch
Range Sliding Clutch
Deep-Reduction
Sliding Clutch
Input Shaft
Mainshaft Gear
Countershaft
Mainshaft Gear
Auxiliary Countershaft
Auxiliary Drive Gear
Output Shaft
Auxiliary Range Gear
Auxiliary Deep-Reduction Gear
Power Flow Diagrams
An understanding of the engine’s power flow through a transmission in each particular gear will assist the technician in troubleshooting and servicing a transmission.
®
The Fuller
front section contains six gear sets which are shifted with the gear shift lever. The second “transmission” called the auxiliary section, contains two gear sets and is shifted with air pressure.
Note: This transmission is referred to as a constant mesh type transmission. When in operation, all gears are turning even
The illustration below shows the transmission with the main components called out. Note that the transmission is in the neutral
position because the sliding clutches are all in their center positions and not engaged in any gears.
transmission can be thought of as two separate “transmissions” combined into one unit. The first “transmission” or
though only some of them are transferring power.
21
Power Flow
Sliding Clutch Forward
Range Sliding Clutch Rearward
Deep Reduction
Sliding Clutch Rearward
Figure 2-4. Front Section Power Flow
Front Section Power Flow
Note: The heavy lines in Figure 2-4 outline the power flow description below. For help in understanding the transmission compo-
nents, refer to Figure 2-3.
1. Power (torque) from the vehicle’s engine is transferred to the transmission’s input shaft.
2. The input shaft rotates the main drive gear through internal splines in the hub of the gear
3. The main drive gear meshes with both countershaft driven gears and the torque is split between both countershafts
4. Because the countershaft gears are in constant mesh with the mainshaft gears, all the front section gearing rotates.
However, only the engaged or selected mainshaft gear will have torque. External clutching teeth on the sliding clutch
will engage internal clutching teeth on the selected mainshaft gear. Torque will now be provided from both opposing
countershaft gears, into the engaged mainshaft gear, and through the sliding clutch to the front section mainshaft
5. The rear of the front section mainshaft is splined into the auxiliary drive gear and torque is now delivered to the auxiliary
section.
22
Power Flow
General Information
Figure 2-5. Front Section Power Flow - Direct Gear
Sliding Clutch Forward
Range Sliding Clutch Rearward
Deep Reduction
Sliding Clutch Forward
Front Section Power Flow - Direct Gear
In direct gear, the front sliding clutch is moved forward and engages into the back of the main drive gear. Torque will flow from
the input shaft to the main drive gear, main drive gear to sliding clutch, sliding clutch straight into the front section mainshaft
which delivers the torque to the auxiliary drive gear. See Figure 2- 5.
Note: All countershaft and mainshaft gears will rotate, but the gears will not be loaded.
23
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