Oerlikon Fairfield Torque-Hub 18HC00, Torque-Hub 18HC00**4 Service Manual

Torque-Hub® Planetary Final Drive
18HC00 Series Service Manual

Rev 13/02/13

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While every precaution has been taken in the preparation of this document, Fairfield Manufacturing Co. Inc. assumes no
liability with respect to the use of the documentation described herein, or for any act or omission of Fairfield Manufacturing
Co. Inc. concerning this documentation. Torque-Hub® is a registered trademark of Fairfield Manufacturing Co. Inc.

Features and specifications are subject to change without notice.

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Planetary Final Drive Service Manual

Content

Introduction 4

Roll and Leak Test 5
Tightening and Torquing Bolts 7
Lubrication Information 8

Disassembly Instructions Main Disassembly 11

Cover Disassembly 13
Input Coupling Disassembly 14
Housing-Spindle Disassembly 16
Output Carrier Disassembly 18
Input Carrier Disassembly 19

Assembly Instructions Cover Subassembly 21

Input Carrier Subassembly 22
Output Carrier Subassembly 24
Input Coupling Subassembly 26
Housing-Spindle Subassembly 27
Main Assembly 29
Assembly Drawing 31
Parts List 32
Assembly Tools 34

General Information Contact Information 43

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Planetary Final Drive Service Manual

Introduction

This manual is a step-by-step guide to the disassembly and
assembly of the 18HC00 Torque-Hub® units with ratios of 57:1 or
lower. It is designed for the customer or mechanic who is repairing
this particular Torque-Hub® model.

Users of this manual should note that each part mentioned is
followed by an identification number enclosed in parentheses.
These part numbers may be referred to in the Parts List and
Assembly Drawing sections of this manual.

Specialized tools used to assemble this unit are noted in the
assembly procedures and diagrammed in the Assembly Tools
section.

Users should familiarize themselves with the procedures for roll and
leak testing, as well as bolt tightening and torquing found on the
following three pages before starting any repairs.

Standard safety practices should be followed during the
disassembly and assembly procedures described. Safety glasses
and safety shoes should be worn, and heavy, heat resistant gloves
should be used when handling heated components. Be especially
alert when you see the word CAUTION. This indicates that a
particular operation could cause personal injury if not performed
properly or if certain safety procedures are not followed. The word

NOTE is used to bring attention to certain procedures or helpful

hints that will aid in the disassembly and assembly process.

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Planetary Final Drive Service Manual

Roll and Leak Test

Torque-Hub® units should always be roll and leak tested before
disassembly (if possible) and after assembly to make sure the unit’s
gears, bearings and seals are working properly. The following
information briefly outlines what to look for when performing these
tests.

The Roll Test The purpose of the roll test is to determine if the unit’s gears are

rotating consistently, easily and properly. It should be able to rotate
the gears in the unit applying constant force to the roll checker. If
more drag is felt in the gears only at certain points, then the gears
are not rolling consistently and easily and should be examined for
improper installation or defects. Some gear packages roll with more
difficulty than others. Do not be concerned if the gears in the unit
seem to roll hard as long as they roll with consistency. Rotate the
gearbox both clockwise and counterclockwise the same number of
turns as the ratio of the unit. The gearbox ratio is the same number
as the last three numbers on the ID tag.

Continued on Next Page

Model Code Roll Test Tool

18HC00xx4xxxxxx

T198122

5

The Leak Test The purpose of a leak test is to make sure the unit is airtight.

To perform a leak test, use the leak test fixture from the table on
page 10. If the tool is not available, the gearbox must be sealed to
perform the test. This can be accomplished by assembling the
sealed input device onto the gearbox at the input end and replace
one of the oil plugs with an air chuck. DO NOT EXCEED 10 PSI
PRESSURE DURING THE LEAK TEST. Higher pressure will create
a false sealing effect in assemblies with lip-seals. The unit has a
leak if the pressure gauge reading on your leak check fitting starts
to fall after the gearbox has been pressurized and allowed to
equalize. Leaks will most likely occur at the pipe plugs, the main
seal or wherever o-rings or gaskets are located. The exact location
of a leak can usually be detected by brushing a soap and water
solution around the main seal and where the o-rings or gaskets
meet on the exterior of the unit and then checking for air bubbles. If
a leak is detected in a seal, o-ring or gasket, the part must be
replaced and the unit rechecked. Leak test at 10 psi for 20 minutes.

Model Code Leak Test Tool

18HC00xx4xxxxxx

T205708

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Planetary Final Drive Service Manual

Tightening and Torquing Bolts

If an air impact wrench is used to tighten bolts, extreme care should
be taken to ensure the bolts are not tightened beyond their specified
torque. The following steps describe how to tighten and torque bolts
or socket head cap screws in a bolt circle.

1. Tighten (but do not torque) bolt “A” until snug.

2. Go to the opposite side of the bolt circle and tighten bolt “B” until
equally snug.

3. Crisscross around the bolt circle and tighten the remaining bolts.

4. Use a torque wrench to apply the specified torque to bolt “A.”

5. Using the same sequence, crisscross around the bolt circle and
apply an equal torque to the remaining bolts.

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Planetary Final Drive Service Manual

Footnotes

Lubrication Information

General Properties The lubricant used in most Torque-Hub® drives should be

petroleum-based gear fluid containing anti-oxidation, anti-foaming
and extreme pressure additives. The lubricant should have a
minimum viscosity index of 95 cst and maintain a minimum viscosity
of 40 cst under normal operating conditions. Some applications
require special considerations; consult the machine manufacturer
and Oerlikon Fairfield for more additional information.

The table below lists the recommended viscosities for various
ambient operating temperatures. These recommendations are
based on temperature rise of 50° to 100°F at normal operating
conditions.

Differential Planetary Simple Planetary

Ambient

Temperature

-40° to -5° F

-5° to 40° F

40° to105° F

105° to 150° F

AGMA

ISO Index

Lubricant

ISO Index

Number

(1)

VG100 3EP VG100 3EP

VG150 4EP VG100 3EP

VG220/VG320 5EP/6EP VG150/VG220 4EP/5EP

(2)

VG460 7EP VG320 6EP

AGMA

Lubricant

Number

1. For operation in this ambient temperature range, synthetic oil is recommended with a pour point of

10°F lower than the minimum ambient temperature.

2.

For operation in this ambient temperature range, synthetic oil is recommended for proper lubricant
life at elevated temperatures.

Continued on Next Page

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Maintenance Oil amounts for each series of Torque-Hub® drives are indicated in

the appropriate series literature. An initial oil change should be
made after the first 50 hours of operation. Subsequent oil changes
should be made at 1,000 hour intervals or annually, whichever
comes first.

Oil temperatures should be not higher than 160° to 180°F for
continuous operation, and no higher than 200°F for intermittent
operation. For special applications, high horsepower, high speeds
or wide temperature changes, please consult Oerlikon Fairfield.

Oil Fill Level When the Torque-Hub® unit is mounted horizontally, unless

otherwise specified, the gearbox should be filled half-full of oil.
Consult the appropriate series literature for approximate fill
volumes. Vertically mounted Torque-Hub® units may require special
lubrication procedures. Please contact Oerlikon Fairfield for
vertically mounted applications.

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DISASSEMBLY

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Planetary Final Drive Service Manual

Main Disassembly

1. Perform a roll check and a leak check prior to disassembling the unit.

2. Remove three magnetic Pipe Plugs (6H) and drain the oil out of the gearbox.

NOTE: Record the condition and volume of the oil.

3. Remove Bolts (27) from the Cover Subassembly.

4. Lift the Cover Subassembly off of the unit.

Continued on Next Page

11

5. Remove the Input Sun Gear (7) if applicable.

6. Lift out the Input Carrier Subassembly from Hub-Spindle Subassembly.

7. Remove the Output Sun Gear (12).

8. Remove the Ring gear (4) out of the Hub-Spindle Subassembly.

9. Remove the Output Carrier Subassembly out of the Hub-Spindle Subassembly.

10. Remove the Input Coupling Subassembly out of the Hub-Spindle Subassembly.

This concludes the Main Disassembly.

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Planetary Final Drive Service Manual

Cover Disassembly

1. Remove the O-Ring (5) from groove in the Cover Plate (6A) and discard it.

2. Remove Thrust Washer (6J) from pockets in the Cover Plate (6A).

3. Remove Pipe Plugs (6H) from the Cover Plate (6A).

4. Remove the Hex Head Bolts (6C) from the Disengage Cap (6D), if required.

5. Remove the Disengage Cap (6D) from the Cover Cap (6B).

6. Pull the Disengage Rod (6E) out of the Cover Plate (6A).

7. Remove O-Ring (6K) from the Cover Cap (6B) and discard it.

8. Remove O-Ring (6F) from Cover Cap (6B) and discard it.

9. Remove Hex Head Bolt (6L) from Cover Cap (6B).

10. Remove Cover Cap (6B) from Cover Plate (6A).

11. Remove O-Ring (6G) and discard it.

This concludes the Cover Disassembly.

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Planetary Final Drive Service Manual

Input Coupling Disassembly

CAUTION: Safety glasses must be worn during these next steps.

1. Remove Retaining Ring (20C) from retaining ring groove of Input Shaft (9).

2. Remove Input Shaft (9) from the splines of the Input Coupling (20A).

3. Remove Spring (20B) from the Input Coupling (20A).

4. Remove Retaining ring (20D) from the groove of the Input Coupling (20A).

This concludes the Input Shaft Disassembly.

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