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