1900 Series Horizontal Splitcase Pumps
Instruction and Repair Manual
23
11/12/18
Oil lubricated bearings are optional on Model 1920 pumps. A fixed oil level is maintained within the bearing cartridge
by an oiler which allows visual indications of reserve oil.
At initial installation and before starting a unit that has been shut down for repairs or for any extended length of time, run
enough lOW-30 weight motor oil through the oiler to maintain a constant oil level to ensure that the bearing will never be
without an oil supply. Oil will have to be added at intervals to maintain a constant level in the oiler. This
interval can be determined only by experience.
Under working conditions, oil will break down and need to be replaced at regular intervals. The length of these intervals
will depend on many factors. Under normal operation, in clean and dry locations, the oil should be changed about once a
year. However, when the pump is exposed to dirt contamination, high temperatures (200°F or above) or a wet location,
the oil may have to be changed every 2 or 3 months.
The motor that drives your Fairbanks Nijhuis™ pump may or may not require lubrication. Consult the manufacturer’s
recommendations for proper maintenance instructions.
REPAIRS:
The pump may be disassembled using the illustrations and text provided. Although complete disassembly is covered, it
will seldom be necessary to completely disassemble your Fairbanks Nijhuis pump.
The illustrations accompanying the disassembly instructions show the pump at various stages of disassembly. The
illustrations are intended to aid in the correct identification of the parts mentioned in the text.
Inspect removed parts at disassembly to determine their reusability. Cracked castings should never be reused. All
packing and gaskets should be replaced with new ones at reassembly simply as a matter of economy; they are much
less expensive to replace routinely than to replace as the need occurs. In general it is economical to return to the
manufacturer for repair only the motor and motor controller.
DISASSEMBLY OF THE PUMP:
Disassemble only what is needed to make repairs or accomplish inspection. Proceed to disassemble the pump as
follows: (See Figure 6 for Models 1920 and 1920F, Figure 7 for Model 1910 and Figure 8 for Model 1940.)
1. Break electrical connection to motor or take similar steps to make certain that drive unit will not be unintentionally
energized during disassembly.
B. Pump positioned horizontally for disassembly.
Pump base removed. Model 1910 or 1940 illustrated.
C. Upper casing, bearing caps and packing removed.
Model 1910 or 1940 illustrated.
