KB21 Service Manual Pub 09-14
99
References
90-A.
READ THIS FIRST
Dis-Assembly and Re-Assembly of Pump
(Standard Rotation is front engine mounted, reverse rotation is rear PTO mounted and cannot be
swapped unless the rotation is changed by re-installing parts differently)
1.Close attention must be paid to the way the pump is assembled. If the rotation of pump the is going to
be reversed, the pump must be disassembled to change the direction of shaft rotation. This would be
done if you were converting a front engine mounted pump to a rear PTO (w/ speed changer) driven
pump. If the same rotation of pump is to be the same as it was when disassembled then it must be
assembled the same way it came apart.
This only applies to the gear type pumps as used on the KB21.
very important, as pump will not operate if assembled wrong. The gears are matched and must be
3. Before any dis-assembly of any component of pump is done, the entire area around pump,
work area, and tools (including service tech’s hands) must be completely free of any dirt or any debris
that could contaminate pump and lines. THERE CAN BE NO DIRT ALLOWED TO ENTER HYDRAULIC
SYSTEM. When parts are being removed do not leave open lines of components that are removed.
4. When cleaning pump components do not used cloth unless it is totally lint free. It is best to use clean
. DO NOT SPIN components with
compressed air, it is dangerous and will damage parts. After cleaning, if parts are not to be assembled
right away, they should be coated with light coat of hydraulic oil and stored where they can not collect
dust.
5. Caution: during disassembly, use extreme caution when prying apart castings. The marring of
machined surfaces could cause leakage. Excessive use of force can result in mis-alignment and serious
damage to parts. Gears are closely matched and must be kept together as a set, when removed from
the pump. Handle them with care to avoid damage to the journals, faces and teeth.
6. During reassembly, care must be taken when installing all the parts. If one part (gear housing,
bearing carrier housing, thrust plates, channel seals, gasket seals, threaded passage plugs or any other
part) is installed in the wrong place or wrong direction, it would cause the pump not to work and/or be
severely damaged. Read all directions as listed in the assembly steps. Installing a small part wrong can
cause major damage.
7. After assembling pump and reinstalling it on tractor, MAKE SURE PUMP IS FULL OF OIL (Pre-
Lubed). Never start engine with new or rebuilt pump unless it is prelube. On models where oil level
This means that oil level in tank
must be higher than the suction line, If any part of the suction line is higher than the oil level in tank pre-
lube pump in addition to coating all components with oil during assembly.
installed the same way as they came out. This should not be difficult as gears are different
width on the tandem pump. The single pump is nearly the same as the tandem pump, except
there is only one set of gears and one gear housing. Most of the directions in this section
reference to the tandem pump, but can be applied to the single pump.
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