20
If the oil is being drained due to oil contamination, it is advisable to drain the oil from the discharge valve
well. The well is between the pump cylinder and separator housing, the oil trapped there can be drained by
removing the pipe plug(s) from the cylinder located above the heads.
When the oil has drained from the pump, close all drains and fill the pump with the quantity and type of oil
shown in the specifications. The oil level will show above the center of the sight gauge until the pump is
started and the oil is distributed through the pump.
7.2.2 OIL CONTAMINATION
When the pump has operated satisfactorily for some time and then gradually the vacuum performance
becomes poor, clean the oil by applying gas ballast, or change the oil as directed in the Changing The Oil
section of this manual. A change in the color of the oil does not necessarily mean that is not satisfactory for
use. On the other hand, vapors may contaminate the oil and not show any color change.
The following factors may cause the pump oil to deteriorate:
• Water and solvents will lower viscosity
• Solid accumulation will increase viscosity and “feel gritty”
• Polymerization and chemical attack on oil will increase viscosity and odor
As a “Rule of Thumb” the oil should be changed if:
• The oil “feels gritty”
• Viscosity changes more than 100 SSU @ 100°F (38°C)
• Oil color becomes opaque
• Smells burnt or acrid smell occurs
• Total Acid Number increases to 0.3
In a new application, it is recommended that the oil be changed at intervals of 500 hours operation, and that
depending on the condition of the oil after that period of operation, according to the guideline above, the oil
change interval be reduced or increased.
If oil contamination is suspected, change the oil and operate the pump for 15 to 30 minutes. Repeat this
procedure as required to flush out all contaminants from the pump or operate the pump with gas ballast as
explained under the
section. See
Gas Ballast
and
Water Handling
sections.
Oil filtration systems are available for filtering solids, water, and acids continuously or periodically.
7.3 REPLACEMENT PARTS
Replacement parts for the KT-150 C Series and KT-300, KT-500 and KT-850 D Series pumps used with
standard hydrocarbon vacuum pump oil are shown on pages 30 & 32. Two levels of maintenance kits are
available for the KT line of pumps. Contact the factory with Serial Number information for kit part numbers
and delivery can be provided at that time.
Various parts particularly internal components for earlier versions of KT-series pumps are different and
cannot be interchanged. Many pumps are ordered and equipped with special modifications and accessories,
or adaptations for special fluids. Therefore when ordering spare parts the pump model and nameplate serial
number must always be provided to insure verification and shipment of the correct parts.
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