1. Identifying Ross/TRW Power Steering Gears
BAB Steering
Identifying Ross/TRW Power Steering Gears
You can click through the program with a
left mouse click or tap the space bar.
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What you need to Know
There is no parts book that will identify the steering gear on any given vehicle.
The part number however is stamped on each gear. This presentation will show you where to locate that part number.
Due to road tar, paint, grease and dirt it can be difficult to see the number.
Finding the number on the gear is the only means to insure you order the correct unit.
BAB is the only re-manufacturer with more than one location.
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3. Important Ross Information
Ross/TRW Steering has approximately 85% of the truck market.
The TAS Series steering gear came out in The THP series came out in 2007.
Both the TAS and THP model gears have “automatic” adjusting poppet valves.
NOTE: “Automatic” means you follow the correct
procedure and the poppets will be automatically
adjusted.
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Ross HF54 Series
The raised or casting number on the case identifies the series of the steering gear. In this example, this six (6) digit number HF tells us that we have a HF54 series gear.
HF542998
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Ross HF54 Series
To properly identify this gear we need to find the five (5) digit stamped stencil number. Example shown is HF54050
The stamped stencil # is usually found at one of these 6 places. Hint, always look under the rubber boot first.
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Ross HF64 Series
The six digit casting # identifying the series of gear
HF642990
The stamped five digit stencil identification # is usually stamped in these locations.
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Ross HFB52 Series
The six digit casting # identifying the series of gear
HFB522987
The stamped five digit stencil identification # is usually stamped in these locations.
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Ross HFB64 Series
The raised or casting number on the case identifies the series of the steering gear. In this example, this six (6) digit number HFB tells us that we have a HFB64 series gear.
HFB642978
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Ross HFB64 Series
The stamped five digit stencil identification # is usually stamped in these locations.
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Ross HFB70 Series
The six digit casting # identifying the series of gear
The stamped five digit stencil identification # is usually stamped in these locations.
HFB702992
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11. Ross Series Poppet Valves
BAB marks the poppet valves with yellow paint.
There is a poppet valve on each end of the gear
The poppet valves must be adjusted after installing the gear. It is the installers responsibility to make this adjustment.
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Ross TAS Series
The TAS Series models are:
TAS40
TAS55
TAS65
TAS85
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Ross TAS65 Series
TAS652993
The six digit casting # identifying the series of gear
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Ross TAS65 Series
The stamped five digit stencil identification # can be found on a flat spot on the end of the gear.
December 2004
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New Ross/TRW Gears
THP Series Gears
THP 45 (the TAS Series was TAS40)
THP 60 (the TAS Series was TAS65)
Changes
25% 30% Smaller gears
System pressure increase to
a max of 3000 psi
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Ross THP 45
Note: Has 3 mounting tangs
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Ross THP 60
Note: Has 5 mounting tangs
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18. THP Part Number Location
Same place as TAS Series
THP60001
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19. Ross TAS and THP Series Poppet Valves
Both the TAS and THP gears have Automatic Adjusting Poppet Valves which must be adjusted after installing the gear.
It is the installers responsibility to make this adjustment.
NOTE: Automatic means you follow a procedure which will automatically adjust the poppet valves
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20. Need Assistance If you need assistance identifying
a gear or wish to check availability
please call the order desk
NOTE:
You will get a person.
We do NOT use an answering service.
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