Regal Velvet Drive 71L Series User manual

A Regal Brand
www.regalbeloit.com
Marine Transmission
Service Manual
71L & 72L Series
A Regal Brand
1208 Old Norris Road
Liberty, SC 29657
PH: 864-843-9234
FAX: [phone]
EMAIL: [email protected]
www.velvetdrive.com
©2015 Regal-Beloit Corporation 7838V-NP/01-15/??K/TG Printed in the USA
Velvet Drive®Transmissions (VDT) has been a leader in the marine industry for over 50 years. Founded in 1948, VDT
has been a Regal company since its purchase from Borg Warner in 1995. VDT products feature quiet, smooth
operation and are manufactured using the highest quality industry standards. Applications include tournament ski
boats, inboard cruisers, sport fishing boats, sailboats, trawlers, center consoles, runabouts, yachts and high
performance boats.
The Liberty Series transmission provides the marine enthusiast the most power density transmission available,
offering more horsepower per cubic inch of space, freeing up more usable boat space where it counts.
Complete Line of Marine Transmissions - Electric Shift Available on Most Models
Series Model Description Ratios Available
71C 1017 In-Line 1.00
71C 1017W In-Line Wakeboard 1.00
72C 1018 High Capacity 1.00, 1.52, 1.88, 2.10, 2.57, 2.91
72V 1005 15 Degree V-Drive Cast Iron 1.21, 1.51, 1.99, 2.50
72L 3007 In Line/Wakeboard 1:1
72L-V 3008 V-Drive/Wakeboard 1.5:1, 1.25:1
72L-X 3011 High Capacity In-Line 1:1
72L-H 3010 High Performance 1:1
72L-HP 3009 High Performance 1:1
Liberty A 3001 8 Degree Down Angle Aluminum 1.00, 1.25, 1.50, 2.00, 2.50, 2.80
Liberty 6000A 3021 8 Degree Down Angle Aluminum 1.00, 1.25, 1.50, 2.00, 2.50, 2.80
Liberty V 2002 12 Degree V-Drive Aluminum 1.25, 1.51, 2.00, 2.50
American Innovation

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T R A N S M I S S I O N S
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Transmission
Assembly
Number
Family
Group
Transmission Ratios
CommentsForward Reverse
3007000M01 72L 1:1 1.10:1 MANUAL SHIFT
3007000E01 72L 1:1 1.10:1 ELECTRIC SHIFT
3008000M01 72LV 1.50:1 1.65:1 MANUAL SHIFT V-DRIVE (FRONT MOUNT)
3008000M02 72LV 1.25:1 1.37:1 MANUAL SHIFT V-DRIVE (FRONT MOUNT)
3008000M03 72LV 2.00:1 2.20:1 MANUAL SHIFT V-DRIVE (FRONT MOUNT)
3008000MT1 72LVTS 1.50:1 1.65:1 MANUAL SHIFT V-DRIVE (THRU SHAFT)
3008000MT2 72LVTS 1.25:1 1.37:1 MANUAL SHIFT V-DRIVE (THRU SHAFT)
3008000MT3 72LVTS 2.00:1 2.20:1 MANUAL SHIFT V-DRIVE (THRU SHAFT)
3008000E01 72LV 1.50:1 1.65:1 ELECTRIC SHIFT V-DRIVE (FRONT MOUNT)
3008000E02 72LV 1.25:1 1.37:1 ELECTRIC SHIFT V-DRIVE (FRONT MOUNT)
3008000E03 72LV 2.00:1 2.20:1 ELECTRIC SHIFT V-DRIVE (FRONT MOUNT)
3008000ET1 72LVTS 1.50:1 1.65:1 ELECTRIC SHIFT V-DRIVE (THRU SHAFT)
3008000ET2 72LVTS 1.25:1 1.37:1 ELECTRIC SHIFT V-DRIVE (THRU SHAFT)
3008000ET3 72LVTS 2.00:1 2.20:1 ELECTRIC SHIFT V-DRIVE (THRU SHAFT)
3009000M01 72LHP 1:1 1.10:1 MANUAL SHIFT
3009000M06 72LHP 1:1 1.10:1 MANUAL SHIFT MERC 6 CLOSE COUPLE
3009000E01 72LHP 1:1 1.10:1 ELECTRIC SHIFT
3009000E06 72LHP 1:1 1.10:1 ELECTRIC SHIFT MERC 6 CLOSE COUPLE
3010000M01 72LH 1:1 1.10:1 MANUAL SHIFT
3010000M06 72LH 1:1 1.10:1 MANUAL SHIFT MERC 6 CLOSE COUPLE
3010000E01 72LH 1:1 1.10:1 ELECTRIC SHIFT
3010000E06 72LH 1:1 1.10:1 ELECTRIC SHIFT MERC 6 CLOSE COUPLE
3011000M01 72LX 1:1 1.10:1 MANUAL SHIFT
3011000M06 72LX 1:1 1.10:1 MANUAL SHIFT MERC 6 CLOSE COUPLE
3011000E01 72LX 1:1 1.10:1 ELECTRIC SHIFT
3011000E06 72LX 1:1 1.10:1 ELECTRIC SHIFT MERC 6 CLOSE COUPLE
3018000M01 71LV 1.5 1.5 MANUAL SHIFT V-DRIVE (FRONT MOUNT)
3018000M02 71LV 1.25 1.25 MANUAL SHIFT V-DRIVE (FRONT MOUNT)
3018000MT1 71LVTS 1.5 1.5 MANUAL SHIFT V-DRIVE (THRU SHAFT)
3018000MT2 71LVTS 1.25 1.25 MANUAL SHIFT V-DRIVE (THRU SHAFT)
3018000E01 71LV 1.5 1.5 ELECTRIC SHIFT V-DRIVE (FRONT MOUNT)
3018000E02 71LV 1.25 1.25 ELECTRIC SHIFT V-DRIVE (FRONT MOUNT)
3018000ET1 71LVTS 1.5 1.5 ELECTRIC SHIFT V-DRIVE (THRU SHAFT)
3018000ET2 71LVTS 1.25 1.25 ELECTRIC SHIFT V-DRIVE (THRU SHAFT)
3019000M01 71LV 1:1 1:1 MANUAL SHIFT
3019000E01 71LV 1:1 1:1 ELECTRIC SHIFT
Models Covered In This Manual

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T R A N S M I S S I O N S
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SEGMENT A: 71L & 72L / 71LV & 72LV
Section Page
I Description
Introduction 5
Theory of Operation 5
II Inspection
General 8
Scheduled Inspection 8
III Maintenance
General 9
Lubrication 9
IV Troubleshooting
General 11
Guidelines 11
V Overhaul
General 14
Disassembly 14
Cleaning 14
Inspection 14
Repair 14
Assembly 15
VI Installation 25
VII Specification 34
VIII Propeller Shaft Alignment &
Five Inch Flange Specifications 36
SEGMENT B: V-DRIVES
Section Page
I General 39
II Repair Kits 43
SEGMENT C: 72LH & 72LHP
Section Page
I Overhaul 45
Assembly 46
II Installation 55
III Specification 56
IV Propeller Shaft Alignment 36
Rebuild Kits 61
Table of Contents

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T R A N S M I S S I O N S
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Table of Contents
Title Page
List of Tables
1 Technical Specifications Models 3007, 3008, 3011, 3018 & 3019................................34
Technical Specifications Models 3009 & 3010 ...............................................56
2 Scheduled Inspections ..................................................................8
3 Troubleshooting ......................................................................11
4 Bolt and Fastener Torques (Non-Lubricated) ...........................................34 & 56
5 Test Pressures Models 3007, 3008, 3011, 3018 & 3019 .......................................34
Test Pressures Models 3009 & 3010 ......................................................56

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T R A N S M I S S I O N S
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The following international symbols are used in this service manual.
This symbol warns of possible personal injury
This symbol warns of possible damage to transmissions.
OEM Original Equipment Manufacturer (Boat/Engine Manufacturer)
WARNING
CAUTION
SEGMENT A
71L & 72L / 71LV & 72LV
71L AND 72L 72LX 72LH AND 72LHP
71LV AND 72LV
71LVTS AND 72LVTS
71L AND 72L 72LX 72LH AND 72LHP
71LV AND 72LV
71LVTS AND 72LVTS

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T R A N S M I S S I O N S
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Section I Description
INTRODUCTION (see figure 1)
The 71L and 72L transmissions consist of a planetary
gear set and multiple disc clutches. The input and out-
put shafts are in line.
Hydraulic pressure is provided by a crescent type
pump. The pump is driven at engine speed by the input
shaft. Oil from the pump is sent to the control valve.
The positions on the control valve are forward-neutral-
reverse. An internal regulator valve controls system
pressure. Oil discharged by the regulator valve is sent
to the oil cooler.
THEORY OF OPERATION
General: Forward is direct drive. A planetary gear set
(1.1 to 1.0 ratio for 72L and 1.0 to 1.0 ratio for 71L) is
used to obtain reverse.
Figure 1. 71L & 72L Transmission Assembly
Description Model
71L
Model
72L
Model 71LV
& 71LVTS
Model 72L
& 72LVTS
Model
72LX
Model
72LH
Model
72LHP
Speeds Fwd.
and Rev.
Fwd.
and Rev.
Fwd.
and Rev.
Fwd.
and Rev.
Fwd.
and Rev.
Fwd.
and Rev.
Fwd.
and Rev.
Approx. Wt. 67 71 113 117 71 85 87
Table 1. Technical Specifications
ID TAG ID TAG ID TAG
71L AND 72L 72LX 72LH AND 72LHP
71LV AND 72LV
71LVTS AND 72LVTS
ID TAG ID TAG
3007 & 3019
3018 & 3008 3018 & 3008
3010 & 30093011

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T R A N S M I S S I O N S
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Section I Description
The transmission oil pump is driven by the input shaft.
It supplies oil pressure to operate the clutch packs,
lubricate parts, and provide cooling.
A damper plate is bolted to the engine flywheel. The
damper plate is splined to connect to the input shaft.
The damper plate reduces torsional vibrations to the
transmission from the engine (see figure 2).
Forward: The forward clutch is applied hydraulically
when the shift lever is placed in the forward position.
This connects the input shaft to the output shaft. The
unit then transmits power at a 1 to 1 speed ratio in the
same direction of rotation as the engine (see figure 3).
Reverse: The reverse clutch is applied hydraulically
when the shift level is placed in the reverse position
(see figure 4). The applied clutch holds the ring gear.
The input shaft and sun gear, driven by the engine,
drive pinions, which drive the carrier output shaft. The
output shaft turns opposite to engine rotation at a 1.1
to 1 speed reduction ratio for model 72L and 1 to 1
speed ratio for model 71L.
Figure 2. Typical Assembly Figure 4. Reverse Power Flow
Figure 3. Forward Power Flow
CAUTION - TRANSMISSION FACE MUST BE
CLEAN AND FREE OF DEBRIS OR PAINT. STONE
FACE TO REMOVE ANY HANDLING DAMAGE
BEFORE INSTALLATION.
TRANSMISSION

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T R A N S M I S S I O N S
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Section I Description
Hydraulic Circuit: Oil from the sump enters the pump
suction passage and is directed to the pump (see figure
5). The pump supplies oil under pressure through pas-
sages to the control and regulator valves.
Oil pressure on the eng of the regulator valve moves
the valve, compressing the spring. This movement
allows oil to flow to the cooler.
Selector Valve: The selector valve shifts the transmis-
sion from neutral to forward or reverse. When selector
valve is placed in the forward position, oil is directed to
the forward clutch. When the selector valve is placed in
reverse position, oil is fed to the reverse clutch. When
one clutch is engaged the other is exhausted by a slot
in the selector valve. Electric shift versions forward and
reverse are controlled by an electric solenoid.
Figure 5. Hydraulic Circuit Schematic
Model 71L & 72L (Electric Shift Shown)

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T R A N S M I S S I O N S
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Section II Inspection
GENERAL
The transmission, cooler, cooler lines, and control link-
age should be inspected at regular intervals. Regular
inspections will ensure proper operation and help
detect minor problems that can be corrected before
they cause a transmission failure.
SCHEDULED INSPECTIONS (see table 2)
The following recommended inspection intervals are
based on normal operating conditions. Intervals should
be adjusted for extremes of temperature or other
adverse operating conditions.
Table 2. Scheduled Inspections
Inspection Task
Inspection Interval
Weekly
Periodic
(1 month or 100 hours,
whichever comes first)
Safety
(annual or 1000 hours,
whichever comes first)
GENERAL
Inspect control linkage and shift lever for operation.
Therese should be no sticking, binding, or looseness.
OIL COOLER AND LINKS
Inspect cooler for signs of leakage, damage, or loose
mounting bolts.
Inspect all connection points for signs of leakage.
TRANSMISSION
Inspect for damage or signs of leakage around
housing and/or bolts.
Remove dipstick. Check oil for signs of water or other
contaminants. Check (smell) oil for signs of burnt oil
(overheating). If found, replace fluid.
See Maintenance.
WARNING
CAUTION
WARNING: Failure to perform these
inspections at required intervals can
result in injury to personnel.
X X
X X
X
X
X
X
X
CAUTION: Failure to perform these
inspections at required intervals can
result in transmission failure.
CAUTION
CAUTION: If oil is discolored or has
been overheated (above 190°F) it
must be replaced.
CAUTION
CAUTION: Check mounting bolts for
tightness. If loose, tighten to torque
specified in OEM manual.

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T R A N S M I S S I O N S
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GENERAL
Maintenance to the transmission will normally consist of
the following items.
• Checking oil level or changing oil. Regular scheduled
oil changes are an important part of the transmission.
When properly adjusted detent ball must be seated
into shift handle holes.
• Checking pressure in each circuit (if a problem is
detected).
LUBRICATION
Due to the various installation angles and oil cooler set-
ups, it may be necessary to adjust your oil level.
Check Oil Level
The transmission should be at operating temperature
(180° max.) to get an accurate oil level reading. Oil will
expand when it is heated. Oil will drain back from the
cooler. Expansion and drainback can significantly affect
oil level.
Warm Oil Level Check
When the transmission is at operating temperature,
place selector lever in neutral. Shut off engine. Carefully
remove transmission dipstick. Immediately insert clean
dipstick (Do not screw into housing to check level) and
read oil level.
NOTE: Oil level must be checked immediately after
engine shut-down to prevent an incorrect reading.
Oil drains back into transmission from the cooler and
cooler lines.
Add or remove oil if necessary. Repeat the above
checking procedure as required until oil is at the dip-
stick mark.
Cold Oil Level Check
For ease of checking the oil prior to engine start-up,
a cold oil level mark can be made. To find the cold oil
level mark, the oil level must first be set according to
the warm oil level checking procedure. Then, let the
boat sit overnight. Insert clean dipstick and read oil
level.
Put a mark on the dipstick at the cold oil level reading.
You can use the new mark the check the oil level when
cold. If oil level adjustment is needed, add oil to the
new mark.
Approved Transmission Fluid
General Motors Dexron III fluids are recommended, but
any of the following automatic transmission fluids are
suitable for use in the 71L-72L transmissions. Approved
Specifications are:
1. General Motors Dexron III or Dexron VI
2. Ford Mercon
Do not mix different brands or types of transmission
fluid.
Changing Oil
Oil in transmission, cooler, and cooler lines should be
changed every 500 hours of operation or annually.
Section III Maintenance
WARNING
WARNING
WARNING: Manual Shift Only. Shift
linkage must be adjusted for proper
operation of transmission.
WARNING: Do not remove dipstick
with engine running. Hot oil can
cause burns.
CAUTION
CAUTION
CAUTION: Transmission mounting
bolts should be checked and
tightened to torque specified in
OEM manual. Do not overtighten!
Damage to the transmission can
result.
CAUTION: Clean around the area of
the dipstick before removing. Small
particles of dirt can cause damage
to internal components and cause
valves to stick.
CAUTION
CAUTION: If the transmission oil
temperature has exceeded 190° F
or the alarm sounds, the oil must
be changed in the transmission and
cooler system.
CAUTION
CAUTION: Severe service
conditions or high operating
temperatures may require more
frequent changes.

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T R A N S M I S S I O N S
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Section III Maintenance
• Place selector lever in neutral. Run engine for five
minutes at 1500 RPM. Shut down engine.
• Drain oil from transmission, cooler and cooler lines
into suitable container.
• Check oil for signs of metal or rubber particles
NOTE: Particles of rubber can indicate cooler line wear.
Each line should be inspected for cracks or fraying and
should be replaced if damaged.
• Fill transmission with new oil.
NOTE: The amount of oil required will vary based on
length of cooler lines. Use an amount equal to about
three-fourths of the quantity removed.
• Screw in and tighten dipstick. Run engine for two
minutes to fill cooler and cooler lines with oil. Set oil
level according to procedure at start of section 3, Page
9, Lubrication.
CAUTION
CAUTION
CAUTION: Clean around the area of
drain plug before removing. Small
particles of dirt can cause damage
to internal components and cause
valves to stick.
CAUTION: A few small metal
particles are normal. However, if
large metal chips or a large number
of particles are found, this could
be an early sign of transmission
failure. The transmission should be
disassembled and inspected for
internal damage.

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T R A N S M I S S I O N S
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Section IV Troubleshooting
GENERAL
Before troubleshooting the transmission, do the fol-
lowing.
• Check oil level and condition of oil. See maintenance
section for details.
• Check transmission, oil cooler and oil cooler lines for
physical damage or leakage. Correct any problem.
• Check that engine, damper plate, or drive train align-
ment are not causing the problem.
Refer to shaft alignment section on Page 78 of this
manual.
Perform all pressure checks at normal operating tem-
perature. Refer to specification section for details.
Pressure gauges used should have a range of 0-300 psi.
They must be accurate.
GUIDELINES
When troubleshooting, shift into each selector position
to determine when noise or problem occurs. Determine
which parts are moving. This will help pinpoint the
cause. Use the following information as a guide to com-
mon problems.
Damper Plate. Some transmission problems are damp-
er plate related. Check and/or replace damper plate
when the following problem occurs.
• Transmission “knocks” at idle or low RPM, then stops
at 1,000 RPM or higher.
If the damper plate springs are too soft, the sides of
the windows will wear. If the springs are too hard,
the splines will wear. Consult engine OEM for correct
damper plate recommended.
Clutches. Check and/or replace clutches if the follow-
ing problem occurs.
• Excessive engine RPM (over the rated RPM). This can
indicate a slipping clutch. The slipping clutch will usu-
ally squeal.
The slipping clutch will normally overheat. This can
result in warped plates. In severe overheating, plates
can weld together. This will cause a tie up condition in
transmission when the other clutch is applied.
WARNING
WARNING: Do not operate trans-
mission if the following condition
is suspected. Failure to comply can
result in personal injury because
transmission cannot be disengaged.

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T R A N S M I S S I O N S
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Section IV Troubleshooting
Problem Cause Correction
LEAKS
1. At pump or output shaft seal Faulty seal Replace
Misalignment Correct
Rough shaft Replace
2. Between seal and bore Rough housing bore Replace seal
3. At gasket(s) Loose bolts Torque bolts properly
Defective gaskets Replace gaskets
Face(s) not flat Replace defective parts
4. Loss of oil with no trace of missing oil Oil leaking from cooler
or cooler lines
Replace cooler, or cooler lines
that are defective
5. Oil out of breather Oil has been overheated
(lost anti-foam additive) Replace oil
High or low oil level Correct oil level
Water in oil Change oil
MALFUNCTION IN BOTH FORWARD AND REVERSE
1. At pump or output shaft seal Regulator valve jammed Clean and polish
Internal leakage Replace defective sealing rings
Low oil level Add oil
Pump defective Replace pump
2. No oil pressure Regulator valve jammed Clean and polish
Internal leakage Replace defective parts
Pump defective Replace pump
No oil Add oil
Pump incorrectly indexed Rotate pump to correct position
3. High oil temperature Regulator valve jammed Clean and polish
Cooler line defective Replace cooler line
Oil cooler too small Install larger cooler
Restrictions in cooler lines
or cooler Back flush to remove restrictions
Defective cooler Replace cooler
Defective temperature sensor Replace sensor
4. No power, noise Broken gear teeth – gears not
meshed Replace defective parts
5. No line presssure Heavy weight oil (90 weight) Remove and use proper weight oil
Pump incorrectly indexed Rotate pump to correct position
Oil inlet shield or screen
blocked Inspect and clean
6. Noisy in forward and reverse Misalignment of damper plate
with engine, or misalignment
of output shaft components
Align drive train components
Damaged gears Replace damaged gears

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T R A N S M I S S I O N S
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Section IV Troubleshooting
Problem Cause Correction
MALFUNCTION IN FORWARD OR REVERSE
1. Clutch drags or does not release Warped clutch plate Replace defective parts
Mechanical failure Replace defective parts
Tight pack clearance Increase clearance to specification
2. Clutch does not apply Low pressure See low oil pressure
Defective parts Replace defective parts
3. Harsh engagement High pressure - valve sticking Clean and polish regulator valve
Engine idle too fast Adjust engine idle
Linkage binding or misadjusted Repair as required and
adjust to OEM spec.
4. Soft engagement Low pressure See low oil pressure
5. Won’t move or sluggish Forward clutch seized Replace defective parts
Worn or broken sealing rings Replace defective parts
MISCELLANEOUS PROBLEMS
1. Hydraulic noise or buzz Low oil level or air in hydraulic circuit Check oil level and fill if low.
Operate engine in neutral at
1200 RPM to remove air.
Regulator valve sticking Clean and polish
2. Gear noise in forward Broken, pitted or cracked gear teeth Replace defective parts
3. Gear noise in reverse Broken, pitted or cracked gear teeth Replace defective parts
MALFUNCTION IN NEUTRAL
1. Drives in forward direction Broken sealing rings or bushings Replace defective parts
Warped forward clutch plates or
mechanical failure of clutch Replace defective parts
Exhaust blocked in control valve Clean control valve
2. Drives in reverse direction Warped reverse clutch plates or
mechanical failure of clutch Replace defective parts
Exhaust blocked in control valve Clean control valve
3. Noisy in neutral only Low oil pressure. Pump gears worn Replace pump assembly
Oil level low Add oil
4. Transmission overheating Oil level low. Cooler too
small or restricted lines
Add oil. All external oil lines should
have minimum inside dia. of 13/32”.
Cooler must permit free flow of oil.
Pump pressure low – worn
or damaged pump
Check pressures. If low, inspect
pump. If worn or damaged, replace.
Clutches slipping Check sealing rings.
Replace if damaged.
Internal leakage bypassing cooler Locate and fix leak
Temperature sensor defective Replace sensor
Incorrect type of oil Drain, flush and replace with
correct type of oil
Regulator valve sticking Clean and polish

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T R A N S M I S S I O N S
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Section V Overhaul
GENERAL
Before removal and disassembly, review the following
procedures. Use the proper hand tools, slings, or hoists
for the job.
DISASSEMBLY
NOTE: Read OEM vehicle manual for specific removal
instructions.
Before starting disassembly, review the exploded view
shown in Figure 8. The transmission can be disassem-
bled following the index numbers shown in Figure 8.
Seals. Remove O-rings, sealing rings and oil seals care-
fully to prevent damage if they must be reused. It is
best to replace these items.
Bearings. Do not remove bearings unless replacement
is required, or cleaning can not be done properly.
• Keep matched parts or sets together. Do not reverse
or mix them.
CLEANING
• Rinse all metal parts in solvent to remove dirt, grease
and transmission fluid.
• Take special care to remove solvent from all parts.
• Air dry clutch plates.
• If O-rings are to be reused, air dry them.
INSPECTION
Case. Inspect for cracks. Check sealing surfaces for
nicks, scratches, or burrs that can cause leaks. Inspect
output shaft bore for signs of wear on one side. This
can indicate misalignment of prop shaft.
Gears. Inspect for unusual wear patterns, chipped,
cracked, or broken teeth.
Bearings. Inspect for chips, cracks, galling, or missing
bearings. Check for signs of overheating.
Threaded Parts. Inspect for stripped, damaged
threads, or burrs.
Springs. Inspect for distortion, cracks or other dam-
age. Check springs against dimensions in specification
section.
REPAIR
• Remove scratches, burrs or minor surface defects with
very fine emery cloth.
• Threaded holes can be retapped using the same size
tap. Do not make the hole oversize.
• Repair or replace all damaged parts.
Assembly
• A new coupling nut must be used as assembly
• Prior to assembly, dip or coat internal parts with trans-
mission fluid. Let excess fluid drain off.
• Use a light coat of vasoline to position or hold a gas-
ket, O-ring or small part for assembly. Apply to sealing
rings before assembly.
CAUTION
CAUTION: Threaded plugs, screws,
bolts and coupling nuts must be
tightened to the torques shown in
Table 4 to prevent premature fail-
ure of transmission.
WARNING
WARNING: Keep work area, tools,
and transmission clean. Wip up any
spilled transmission fluid to prevent
accidents. As required, wear safety
glasses, safety shoes and a hard hat
to prevent personal injury.
WARNING
WARNING: Cleaning solvents can
be toxic, flammable, an irritant to
the skin, or give off harmful fumes.
Avoid prolonged contact, inhalation
of vapors, or smoking. Failure to
comply can result in injury or death
to persons.

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T R A N S M I S S I O N S
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Section V Overhaul
• Inspect assemblies pressed together for proper fit
and position.
• Check that each snap ring is fully engaged in groove.
• Threaded plugs, screws and bolts should be tight-
ened to the torques shown in Table 4.
NOTE: The following procedures are correct for most
transmissions. Minor differences may be found on some
models.
• Assemble the transmission using the following pro-
cedures. If a reduction unit is mounted to the transmis-
sion, refer to the correct section at the back of this
manual for assembly procedures.
STEP 1. If removed, install the following parts in case.
Tighten threaded parts to torque shown in Table 4.
Press bearing into back of case.
Apply loctite #565, or equivalent, to threads of pipe
plugs and thread into side of case.
STEP 2. Install screen in case with slot facing bottom
of case.
Thread bushing into side of case and tighten to torque
shown in Table 4.
STEP 3. Install baffle in case. Place thrustwasher if used
on face of housing bore. Notch in thrustwasher must
align with notch in case.
STEP 4. Lubricate all sealing rings with vasoline.
If removed, press bearings into pinion carrier. Contact
Velvet Drive for proper depth of bearings.
Install sealing rings in grooves of pinion carrier.
Compress each sealing ring until it locks in place.
Install pinion carrier in case.
CAUTION
CAUTION: Thrustwasher is used on
some models. Close couple options
only. (See Model Chart 71L and 72L
Transmissions.)
Case Assembly 1
Case Assembly 2
Pinion Carrier Assembly
PIPE PLUGS
BREATHER
BEARING
CASE
OIL INLET
SCREEN
PLUG
BEARING

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T R A N S M I S S I O N S
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Section V Overhaul
STEP 5. Starting with a friction clutch plate, alternately
stack friction clutch plates and steel clutch plates.
Friction clutch plates are designed with 3 missing teeth
120° apart. When installed in a ring gear, they should
be installed with the missing teeth aligned with the 3
large drain holes as shown in detail “C”.
STEP 6. Install clutch plates and pressure plate in ring gear.
STEP 7. Install spacer ring 4755 in ring gear.
STEP 8. Lubricate O-ring lightly with vasoline and install
in groove of forward clutch cylinder.
Forward Clutch Pack Arrangement: Figure B
Detail C
Forward Clutch Pack Arrangement: Figure A
Forward Clutch Pack Assembly
Snap Ring Installation
O-Ring Installation
CAUTION
CAUTION: Several different snap
rings are used to assemble the
clutch group. They have different
thickness. Be sure the correct snap
ring is used.

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T R A N S M I S S I O N S
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STEP 9. Lubricate clutch spring bearing ring and piston
sealing ring with vasoline.
Install clutch spring bearing ring in groove of piston.
Install piston sealing ring in outer groove of piston.
NOTE: Check that piston sealing ring is not twisted, cut
or deformed. Replace if damaged.
STEP 10. Install piston in forward clutch cylinder. Be
careful not to damage sealing ring during assembly.
STEP 11. Place clutch Belleville (dish) spring inside rim
of forward clutch cylinder. Spring is dished. The inside
of the spring should be lower than the outside.
STEP 12. Install ring gear over forward clutch cylinder,
with piston and spring facing up. Press ring gear down
over forward clutch cylinder.
Section V Overhaul
Clutch Ring Installation
Piston Installation
Clutch Spring Assembly
Forward Clutch Cylinder Installation
CAUTION
CAUTION: Check to see that clutch
spring bearing ring is still seated in
the groove of clutch piston.

18
T R A N S M I S S I O N S
®
Section V Overhaul
STEP 13. Remove clutch assembly from press. Install
snap ring in groove of ring gear. (Snap ring 4822)
STEP 14. Place ring gear in press with external splines
facing down. Assembly tool should support the ring
gear only. The forward clutch cylinder should not be
touching the assembly tool. Press forward clutch cyl-
inder against snap ring. Remove clutch assembly from
press.
STEP 15. The following instructions are for the 71L and
72L models.
Push down, by hand, on clutch plates. Measure snap
ring gap. Select proper thickness snap ring or combi-
nation of snap rings to set clutch pack clearance. Refer
to clutch end play chart. More than one snap ring may
be required.
Clutch End Play Chart
Model Assembly
Number
Clutch
End Play
71L (all) 3018 and 3019 .018/.053
72L, 72LV (all) 3007 and 3008 .035/.055
72LX 3011 .035/.050
Part
Number
Snap Ring Thickness
in. mm
10-00-139-048 .033 - .037 .84 - .094
10-00-139-049 .050 - .054 1.27 - 1.37
4768 .050 - .054 1.3 - 1.4
10-00-139-018 .062 - .066 1.6 - 1.7
4768A .074 - .078 1.9 - 2.0
4768B .096 - .100 2.4 - 2.5
CAUTION
CAUTION: Several different snap
rings are used to assemble the
clutch group. They have different
thickness. Be sure the correct snap
ring is used.
Snap Ring Installation
Compressing Clutch Pack
Snap Ring Selection