Maintenance
Model API 3171 Installation, Operation, and Maintenance Manual
39
3. Replace worn parts.
Bearing maintenance
These bearing lubrication sections list different temperatures of the pumped fluid. If the
pump is ATEX-certified and the temperature of the pumped fluid exceeds the permitted
temperature values, then consult your ITT representative.
Thrust bearings
The pump comes with a grease-lubricated duplex thrust bearing. The bearing is pre-lubricated
at the factory. Regrease the bearing according to the schedule in the following table.
Table 4: Lubricating intervals in operating hours
Drive-unit size
group
Below 1800 RPM
1800 RPM
3000 RPM
3600 RPM
S/ST
2,000
2,000
1,200
750
M/MT
2,000
1,800
800
450
L
2,000
1,200
—
—
Lubricate the bearings after a shutdown period
1. Flush out the bearings and bearing frame with a light oil to remove contaminants.
During flushing, make sure to rotate the shaft slowly by hand.
2. Flush the bearing housing with the proper lubricating oil to ensure oil quality after cleaning.
3. Refer to Reassembly section for proper bearing greasing procedure.
Lubricating-oil requirements
Oil requirements based on temperature
For the majority of operating conditions, bearing temperatures run between 49°C | 120°F and
82°C | 180°F, and you can use an oil of ISO viscosity grade 68 at 38°C | 100°F. If temperatures
exceed 82°C | 180°F, refer to the table for temperature requirements.
Table 5: Oil requirements based on temperature
Temperature
Oil requirement
Bearing temperatures exceed 82°C | 180°F
Use ISO viscosity grade 100
Pumped-fluid temperatures exceed 177°C | 350°F
Use synthetic lubrication.
Lubricating-grease requirements
Precautions
NOTICE:
• Avoid equipment damage or decreased performance. Never mix greases of different
consistencies (NLGI 1 or 3 with NLGI 2) or with different thickeners. For example, never
mix a lithium-based grease with a polyurea based grease. If it is necessary to change the
grease type or consistency, remove the rotor and old grease from the housing before
regreasing.
Bearing temperature
Bearing temperatures are generally about 18°C | 20°F greater than bearing-housing outer surface
temperatures.
This table shows the type of grease required for the operating temperature of the pump.
Bearing temperature
Type of grease
-15°C to 110°C | 5°F to 230°F
Use a lithium-based mineral-oil grease with a con-
sistency of NLGI 2.
Exceed 177°C | 350°F
Use a high-temperature grease. Mineral-oil greases
should have oxidation stabilizers and a consistency
of NGLI 3.
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