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Introduction
The HD Series pumps have been certified to the requirements of the ATEX Directive 94/9/EC for use in Category II, Group 2 G applications.
Read this manual before operating or working on the HD Series pumps. If additional information is required to facilitate operation or
maintenance, contact the authorized Tuthill distributor shown at the back of this service manual.
HD Series pumps have been designed and manufactured to provide years of service under normal operating conditions. Illustrations
used in this manual are for reference purposes only. Consult the factory or an authorized Tuthill distributor for proper part identification.
When ordering replacement parts, provide as much detail as possible to ensure correct parts are provided. Details should include the
full model number (typically 12-13 digits but can be 18 digits), serial number, name of part, part number (if known), and part material.
Service Manual # 71 for the HD Series pumps is available at www.tuthillpump.com. The materials furnished for each pump are selected
to suit individual applications.
WARNING
Failure to follow these instructions could result in serious bodily injury or death. Do not attempt to work on any Tuthill pump installation
before completing the steps below. Disconnect the drive so that it cannot be started while work is being performed. Review the Material
Safety Data Sheet (MSDS) applicable to the liquid being pumped to determine its characteristics and the precautions necessary to
ensure safe handling. Vent all pressure within the pump through the suction or discharge lines.
All Tuthill pumps contain residual hydraulic oil from the factory production test. Determine if this is compatible with the fluid you are
pumping. If the fluid is incompatible, then the pump must be fully flushed prior to use. If the pump is to be operated at elevated
temperatures, the pump should be brought up to operating temperatures gradually. Rapid or sudden introduction of liquids at
elevated temperatures into the cold liquid chamber of the pump could cause damage to pump externals, seals or other internal parts.
Pumps can run dry provided provisions are made for the mechanical seal if one is used. Failure to comply with this could cause severe
damage to the mechanical seal parts. Pump needs to be earthed separately to avoid a buildup of electro-static charge.
General Description
The design of the Tuthill Industrial Series incorporates externally timed impellers that are supported in the fluid chamber by double
row, ball bearings located out of the product stream. This design enables the industrial Series to handle highly viscous abrasive slurries,
corrosive acids or suspended solids without degradation, aeration or contamination of the product.
Pumping Principle
Here is How it Works
Rotating impellers develop a vacuum at inlet, drawing material into the cavity…positive action of the impellers displaces material,
forcing discharge at pump outlet. Ports are always open; sealing action between impellers and housing prevents fluid flow return.
