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TH55-E90 Oilfield Transmission

TH55-E90 Oilfield Transmission

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-E90 transmissions are ideal for pressure pumping applications. TH55-E90 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-E90 oilfield transmission. Gross input power: 2461 bkW (3300 bhp).

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Gross Input Power3300BHP

Gross Peak Input Torque9350ft-lb

Rated Input Speed1900r/min


1F Gear Ratio4.67

2F Gear Ratio3.43

3F Gear Ratio3.03

4F Gear Ratio2.53

5F Gear Ratio2.22

6F Gear Ratio1.85

7F Gear Ratio1.64

8F Gear Ratio1.36

9F Gear Ratio1.00


Cat C3512C (HD)

Cat 3516C (HD)

Cummins QSK50

Cummins QSK60

MTU 12V4000

MTU 16V4000


Input rotation — counterclockwise

Output rotation — counterclockwise(as viewed from rear)


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)


2 oil cooler lines

1 electrical connector

1 pump


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


Electronic Control Unit (ECU)

Electronic data link, SAE J1939

Electrical system 24V



Mounting type

Rated power



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