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Introduction

The OTC 4278 Hydraulic Flow Meter has been designed for easy connection to a hydraulic 

circuit so that flow, pressure and temperature can be readily checked. The Flow Meter can 

take full back pressure up to 6000 psi (420 bar), and the built-in loading valve enables many of 

the operating conditions to be simulated. The unit can be connected anywhere in the hydraulic 

system to test pumps, motors, valves and cylinders in both flow directions.

Safety Precautions

CAUTION

: To prevent injury and / or property damage,

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  Study, understand, and follow all safety precautions and operating instructions before 

using this equipment. If the operator cannot read instructions, operating instructions 

and safety precautions must be read and discussed in the operator’s native language.

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  No alteration shall be made to this product.

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  Inspect the condition of the equipment before each use; do not use if damaged, 

altered, or in poor condition.

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  Ensure load valve is fully open prior to testing.

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  Wear eye protection that meets the standards of ANSI Z87.1 and OSHA.

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