Well Service Transmissions TH55-E70

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Key Specs

Gross Input Power
3300 BHP
2461 bkW
Gross Peak Input Torque
9350 ft-lb
12677 N·m
Rated Input Speed
1900 r/min
1900 r/min


Your operation depends on the power driving it. And your transmission is as crucial to your power solution as the engine. Cat transmissions are proven in the oil and gas industry and widely known for their exceptional power, leading durability, ease of operation, and shifting options.TH55-E70 transmissions are ideal for pressure pumping applications. TH55-E70 transmissions are optimized for use with Cat 3512C (HD), Cat 3516C (HD), Cummins QSK 50, Cummins, QSK 60, MTU 12V4000. and MTU 16V4000 engines.Cat transmissions are backed by the worldwide network of Cat dealers ready to support your operation with technical support, service, parts, and warranty.Cat TH55-E70 oilfield transmission. Gross input power: 2461 bkW (3300 bhp).

Product Specifications for TH55-E70

Gross Input Power 3300 BHP 2461 bkW
Gross Peak Input Torque 9350 ft-lb 12677 N·m
Rated Input Speed 1900 r/min 1900 r/min
Gears 7F/0R 7F/0R
1F Gear Ratio 6.25 6.25
2F Gear Ratio 4.59 4.59
3F Gear Ratio 3.38 3.38
4F Gear Ratio 2.48 2.48
5F Gear Ratio 1.83 1.83
6F Gear Ratio 1.36 1.36
7F Gear Ratio 1.00 1.00

TH55-E70 Standard Equipment

Cat Engines for Optimized Power Train

  • Cat C3512C (HD)
  • Cat 3516C (HD)
  • Cummins QSK50
  • Cummins QSK60
  • MTU 12V4000
  • MTU 16V4000

Transmission Rotation

  • Input rotation — counterclockwise
  • Output rotation — counterclockwise(as viewed from rear)

Torque Converter

  • Integral torque converter
  • Series — TC64442-ESLF
  • Stall torque ratio — 2.23


  • Clutches — electro-hydraulic fully modulated, oil cooled, multidisc
  • Clutch modulation control — Cat Electronic Clutch Pressure Control (ECPC)

Installation Connections

  • 2 oil cooler lines
  • 1 electrical connector
  • 1 pump

Oil System

  • Cat Transmission/Drive Train Oil-4 (TDTO)
  • Sump oil temperatures
  • Hydraulic fill capacity — Approx. 189 L (50 gal), subject to cooler size, lines, and installation.
  • Filter Type — 6 micron synthetic, cartridge remote mount


  • Input connection (flywheel) — SAE #0
  • Output connections (flange)
  • Structural application subject to Caterpillar approval

Control System

  • Electronic Control Unit (ECU)
  • Electronic data link, SAE J1939
  • Electrical system 24V

Power Take-Off Drives

  • Location
  • Mounting type
  • Rated power

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