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TAS Series

TAS Series Power Steering Gear
Engineered for medium and heavy duty vehicles operating on and off the highway, TAS Series Power Steering Gears from TRW feature unrivaled torque output and performance, positive steering control and responsive handling.

Meeting Every Torque Demand
TRW’s TAS Series is designed to meet the needs of Class 5-8 heavy duty vehicles. With six readily available models, these gears can accommodate torque demands for a variety of steering systems. And optionally available RCS assist gears provide extra power for severe heavy duty applications.

Designed to Run Cool and Comfortable
In line with more than a century of industry-leading innovation, the rotary valve design of TRW’s TAS Series gives you a quality, comfortable steering feel and the reliability of lower operating temperatures.

Long-Lasting and Easy to Install
The TAS Series Power Steering Gears from TRW use automatic poppets, providing both ease of installation and a standard automatic bleed system to improve steering performance and increase system life.

Performance Specifications
  TAS37 TAS40 TAS55 TAS65 TAS66 TAS85
Front Axle 
Weight
8,000 lbs
3,500 kg
9,000 lbs
4,000 kg
12,000 lbs
6,500 kg
14,300 lbs
6,500 kg
14,600 lbs
6,600 kg
18,000 lbs
8,200 kg 
Pressure
Rating
1,958 psi
135 bar
2,175 psi
150 bar
2,175 psi
150 bar
2,175 psi
150 bar
2,364 psi
163 bar 
2,175 psi
150 bar
Output
Torque at
Rated 90%
Efficiency 
25,925 in/lbs
2,930 N-m
 28,450 in/lbs
3,214 N-m
 35,300 in/lbs
3,988 N-m
 43,050 in/lbs
4,864 N-m
 46,737 in/lbs
5,280 N-m
 58,850 in/lbs
6,649 N-m
Gear Travel 100° 95° 95°  95°  95°  95° 
Gear Ratio(s) 17.8:1 20.4:1, 18.4:1 20.4:1, 18.4:1 20.4:1, 18.4:1 20.4:1, 18.4:1 23.3:1, 21:1
Output Shaft
Diameter
1.75 in
44.5 mm
1.75 in
44.5 mm
2.00 in
50.8 mm
2.00 in
50.8 mm
2.00 in
50.8 mm
2.25 in
57.15 mm
Output Shaft
Serrations 
1.75 x 46
Straight
1.75 x 46
Straight
1.937 x 52
Straight
1.937 x 52
Straight
1.937 x 52
Straight
2.25 x 59
Straight
Input Shaft
Serrations 
.812 x 36
Straight 
.812 x 36
Straight
.812 x 36
Straight
.812 x 36
Straight
.812 x 36
Straight
.812 x 36
Straight
Maximum
Operating
Temperature
250° F
121° C
250° F
121° C
250° F
121° C
250° F
121° C
250° F
121° C
250° F
121° C
Minimum
Pump Flow
1.5 hwt/sec 
2.5 gpm
9.5 lpm
2.2 gpm
8.3 lpm
2.7 gpm
10.2 lpm
3.0 gpm
11.3 lpm
3.0 gpm
11.3 lpm
3.6 gpm
13.6 lpm
Recommended
Pump Flow Control Range
3.6-5.0 gpm
13.6-18.9 lpm
3.6-5.0 gpm
13.6-18.9 lpm
3.6-5.0 gpm
13.6-18.9 lpm
3.6-5.0 gpm
13.6-18.9 lpm
3.6-5.0 gpm
13.6-18.9 lpm
4.2-8.0 gpm
16-30
lpm
Approximate
Dry Weight 
55.4 lbs
25.1 kg
60 lbs
27 kg
73 lbs
33 kg
78 lbs
35 kg
78 lbs
35 kg
98 lbs
44 kg
Dependable Features
  • Available in six different models to meet steering system torque demands 
  • Gears are designed to meet the needs of Class 5-8 heavy duty vehicles 
  • Rotary valve design is expertly tuned for steering feel and lower operating temperatures 
  • Automatic poppets offer ease of installation and a standard automatic bleed system to improve steering performance and increase steering system life 

Download Product Sheet

RCS Steering Gear Thumbnail

RCS Assist Gear Option Available



RCS Assist Gears, available as a TAS gear option, provide extra power for severe heavy duty applications.

TRW

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