Bison Pumps 1900 - Maintenance; Cup Seals and O-ring

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Maintenance
Replacement components are shown in Details K & L.
Under normal operating conditions, your Bison Pump should not require maintenance beyond
winterization. However, some situations can result in excessive wear and/or damage to various pump
components.
Cup Seals and O-ring – Under normal usage these seals should last many years. The wear on these parts
is directly related to the amount of usage of the pump and the condition of the water being pumped.
Water that has contaminants that could act as an abrasive will cause excessive wear on the Packing
Gland, Piston Cup Seals and O-rings.
In cases of the combination of high usage and/or low water quality, the sealing components may need
to be replaced. Bison Pumps offers a Seal Maintenance Kit which consists of replacements for sealing
components in the pump and a Seal Pick Tool. See the table below for contents of the Seal Maintenance
Kit. Instructions are included with the Seal Maintenance Kit.
Bison Pumps Seal Maintenance Kit Includes:
Part Number
Description
Quantity
04-000-1-50-19
Ny-Loc Nut, Shoulder Bolt
1
04-000-1-50-20
Ny-Loc Nut, Link Connection
2
04-000-5-40-01
Link Washer
12
04-000-5-40-02
Backing Washer
1
04-000-5-75-01
Check Valve
2
04-001-3-71-01
Packing Gland Cup Seal
1
04-002-3-71-01
Piston Cup Seal
2
04-022-1-68-01
Internal Snap Ring
2
04-070-3-70-01
Drain Valve Seat O-Ring (drain back feature only)
1
04-070-3-70-02
Drain Pin O-Ring (drain back feature only)
1
04-139-3-70-02
O-Ring Buna
1
50-001-0-04-05
Rod Connector Screw
1
50-001-0-08-02
Custom Low-Profile Fastener
1
50-100-0-07-00
Packing Gland Nut
1
50-100-0-08-05
Bottom Bushing
1
55-001-0-07-00
Seal Pick Tool
1
Note: Bison Pumps recommends thoroughly cleaning the inside components of the pump during this
maintenance process. It is best to remove components that will be replaced first, then clean the inside of
the pump and then install the new components. During this process, inspect the Check Valves in the
bottom of the Piston and Check Valve Housing in the bottom of the pump body. Look for any large debris
that may prevent the Check Valve from closing. Clean any debris found inside the Check Valves. With
proper care, these Check Valves should last a lifetime. However, large debris can damage them in
extreme situations. If over time the pumping action becomes more difficult, apply Extra Virgin Olive Oil
to the piston cup seals and inside the pump body. Do not use petroleum products to lubricate the pump.
Bison Pumps
www.bisonpumps.com
Model 1900 Owner's Manual Rev C
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