NHTSA ID Number: 10245039
Manufacturer Communication Number: BW8184
TSB/Document Date: 2023-11-07
Summary
Power Steering Gear Technical and Application guide. This document includes application guidelines and troubleshooting information for steering gears remanufactured by Bendix
and Shepherd brands.
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TSB/Document ID: BW8184
Replacement Service Bulletin Number:
MFR Communication Date: 2023-10-18
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STEERING
MFR Component System:
MFR Component Subsystem:
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POWER STEERING GEAR
TECHNICAL & APPLICATION GUIDE
Applicable for All Makes by Bendix
and Genuine Sheppard™ Reman
TABLE OF CONTENTS
PRODUCT AND TECHNICAL GUIDE INTRODUCTION
TRADEMARK INFORMATION
PRODUCT LINE
PRODUCT FAMILY SPECIFICATIONS AND RATINGS
SHEPPARD™-TYPE GEAR PRODUCT FAMILY INFORMATION
ZF™ TRW™-TYPE GEAR PRODUCT FAMILY INFORMATION
IDENTIFYING THE GEAR COMPONENTS
HOW TO ORDER THE CORRECT GEAR PART NUMBER
GEAR TYPE
IDENTIFYING ZF™ TRW™ TAS/THP-TYPE GEARS
Gear part number
Gear housing casting number
IDENTIFYING ZF™ TRW™ HF-TYPE GEARS
IDENTIFYING ZF™ TRW™ HFB-TYPE GEARS
IDENTIFYING SHEPPARD™ M-SERIES™ GEARS
Identify the gear size
Identify the gear part number
IDENTIFYING SHEPPARD™ D-SERIES™ GEARS
Identify the gear size
Identify the gear part number
IDENTIFYING SHEPPARD™ 92-SERIES™ GEARS
Identify the gear size
Identify the gear part number
ADDITIONAL GEAR IDENTIFICATION METHODS
FRAME MOUNTING PADS
DETERMINE THE NUMBER OF LINES OR HOSES
RELIEF VALVE
INPUT SHAFT CONFIGURATIONS
Notch
Notch and flat
Full bolt groove
BENDIX TECH TEAM
TROUBLESHOOTING GUIDE
BINDING, DARTING, AND OVERSTEER
DIRECTIONAL PULL
EXTERNAL LEAKAGE
HARD STEERING
NON – RECOVERY
REDUCED WHEELCUT
ROAD WANDER OR LOOSE STEERING
SHIMMY
STEERING WHEEL KICK
3
3
4
5
5
6
7
9
9
10
10
10
11
11
12
12
12
13
13
13
14
14
14
15
15
16
17
18
18
18
18
19
20
20
22
23
24
26
28
29
30
31
2
INTRODUCTION
Bendix is a supplier of remanufactured power steering gears for the commercial vehicle aftermarket. This product
and technical guide offers an overview of our product line and product offerings.
The guide includes a step-by-step process to correctly determine the gear part number for all gears offered in
our product portfolio. Properly identifying the gear part number for you is an important part of our quality plan,
customer satisfaction objectives, and overall business.
The power steering gear on commercial vehicles is located in an area of the truck exposed to the
environment; therefore, simply reading a part or serial number on the gear can be rather difficult in many cases.
Following the step-by-step process described in this guide – along with the vehicle application information –
helps ensure we provide the correct gear for your vehicle.
The troubleshooting tips at the end of this document offer frequently asked questions to help identify, diagnose,
and solve typical installation or performance issues with commercial vehicle power steering gears.
3
INTRODUCTION
Bendix offers a complete line of power steering gears for the commercial vehicle aftermarket industry. Our gears are
utilized on all major brands of on- and off-highway commercial vehicles, including the brands below.
Two (2) tier one suppliers -- TRW and R.H. Sheppard Co. Inc., -- deliver original equipment power steering gears in
this industry. Bendix produces a full range of reman gear part numbers originally produced by these manufacturers.
There are hundreds – perhaps thousands – of unique part numbers used in this industry. Despite that volume,
we find that 16 or 20 of the most popular gear part numbers comprise 95 percent of the overall market demand.
To ensure we have “best-in-class” coverage and inventory availability, we maintain 100-150 unique gear part
numbers in stock and offer a one- to two-day turnaround on Repair and Return (R&R) service to support you with
gear part numbers not currently stocked.
4
PRODUCT FAMILY SPECIFICATIONS AND RATINGS
SHEPPARD™-TYPE GEAR PRODUCT FAMILY INFORMATION
The following tables illustrate various features and operating parameters for the Sheppard™-type steering gear
product families.
M80™
M90™
M100™
M110™
Front axle weight (lbs)
9000
12000
14000
20000
Pressure rating (psi)
2350
2350
2350
2175
Gear travel (°)
100
95
95
100
Maximum operating temperature (°F)
250
250
250
250
Minimum pump flow (gpm)
2.1
2.5
3.0
3.5
Recommended pump flow range (gpm)
2.1-3.5
2.5-4.0
3.0-4.5
3.5-5.0
Approximate weight - dry (lbs)
50
65
75
110
MD83™
HD94™
SD110™
XD120™
Front axle weight (lbs)
10000
14600
18000
23000
Pressure rating (psi)
2683
2683
2756
2175
Gear travel (°)
95
95
95
96
Maximum operating temperature (°F)
250
250
250
250
Minimum pump flow (gpm)
2.4
2.9
3.7
4.8-5.8
Recommended pump flow range (gpm)
2.4-3.4
2.9-4.4
3.7-5.2
4.8-5.8
Approximate weight - dry (lbs)
60
70
85
150
5
PRODUCT FAMILY SPECIFICATIONS AND RATING
ZF™ TRW™-TYPE GEAR PRODUCT FAMILY INFORMATION
The following tables reference various features and operating parameters for the ZF™ TRW™-type steering gear
product families.
TAS37
TAS40
TAS55
TAS65
TAS66
TAS85
Front axle weight (lbs)
8000
9000
12000
14300
14600
18000
Pressure rating (psi)
1958
2175
2175
2175
2364
2175
Gear travel (°)
100
95
95
95
95
95
Maximum operating temperature (°F)
250
250
250
250
250
250
Minimum pump flow (gpm)
2.5
2.2
2.7
3.0
3.0
3.6
Recommended pump flow range (gpm) 3.6-5.0
3.6-5.0
3.6-5.0
3.6-5.0
3.6-5.0
4.2-8.0
Approximate weight - dry (lbs)
60
73
78
78
98
THP45
THP60
PCF60
Front axle weight (lbs)
9000
14300
14300
Pressure rating (psi)
2683
2683
2683
Gear travel (°)
100
100
100
Maximum operating temperature (°F)
250
250
250
Minimum pump flow (gpm)
2.4
2.9
2.9
Recommended pump flow range (gpm)
3.6-6.3
3.6-6.3
3.6-6.3
Approximate weight - dry (lbs)
58
63
63
55
6
IDENTIFYING THE GEAR COMPONENTS
IDENTIFYING THE GEAR COMPONENTS
Pressure and
Return Ports
Gear Housing
ID Pad
Auxiliary Port
Valve Housing
• Pressure and Return Ports: These ports are connection points for the hydraulic lines to and from the power
steering pump. Typically, one (1) of the ports will have an embossed letter in the casting: “P” for the pressure port
or “R” for the return port.
• Valve Housing: This casting is bolted onto the cylinder bore of the gear housing and contains the mechanical
valve of the steering gear.
• Gear Housing: This is the main casting of the steering gear and contains the rack piston and output shaft.
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