Service Manual 73
Page 5 of 32
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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.
Do not run the pump dry. Failure to comply with this could cause severe damage to the internal
seal, bushings and/or metal parts.
Installation
For optimum pump performance the suction line must be at least as large as the corresponding
pump port. It should be as short as possible in order to avoid excessive pressure drops and must
be airtight. Locate the pump as close to the source of supply as conditions permit and if possible,
below the level of the liquid in the reservoir. When necessary to locate the pump in a pit,
provisions should be made to safeguard against flooding.
When handling high viscosity liquids, the speed of the pump must be reduced and the size of the
inlet lines increased to prevent cavitation. Refer to the NPSHr data for the pump. The GlobalGear
series of pumps provides a orifice vent to the seal chamber in the bracket from one of the
housing’s ports ( typically the suction port). On applications where the viscosity is 7500 SSU or
greater, the orifice plug should be removed so there is no restriction on the vent hole.
Pumps should be filled with liquid at installation and should never be allowed to run dry.
The placement of a strainer on the suction side of the pump will restrict any solids or abrasives
from entering the pump, which could cause internal damage.
Under no conditions should the pump be used to support external piping loads (weight or
expansion). Piping and other equipment should be independently supported. Piping strain can
result in misalignment, hot bearings, worn couplings, vibration, etc. It is important that the piping
used be clean and free of chips and scales.
The discharge line must be designed with the maximum pressure rating of the pump in mind.
Excessive pressure could cause damage to your motor and/or pump. If a pressure relief valve