Great-plains TSF1290 Operator Manual User Manual download pdf (Page 69)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 65

05/10/2012 500-641M

Pump Maintenance & Repair

The Great Plains pump is designed for long life and ser-

vice. Through the years there may be a need to replace

the mechanical seal or service some component of the

pump. A mechanical seal may weep slightly, but if it

starts to drip the pump will have to be disassembled.

Before disassembling the pump be sure to wash it out

with fresh water. Refer to the parts manual for the com-

ponents of the pump.

Refer to Figure 57

If the pump is leaking, before removing it from the

sprayer, run the pump with adequate water in the tank to

diagnose the actual pump problem. If ﬂuid leaks out

between the front suction housing and the rear volute

housing , the housing gasket may be dried out. Give

the gasket adequate time to absorb moisture and

swell up. If necessary, retighten the volute housing by

alternating on opposite sides until all nuts are torqued

to 16 - 18 ft.-lbs. It is a good practice to apply grease to

both sides of the gasket to prevent shrinkage.

If seal replacement is required:

1. Disassemble pump and clean all components.

2. Assemble the ceramic ring seat of the mechanical

seal into the volute housing of the pump. Make

sure the ceramic seat is positioned square into the

volute housing.

3. Clean off any grease or dirt from pump shaft and

dry the shaft so the rubber bellows on the mechani-

cal seal will adhere to the shaft properly when

assembled.

4. Bolt up the pump input bearing housing (not shown)

to the volute housing using bolts , and with

spacers (not furnished) for alignment and assembly

of the shaft seal.

5. Assemble the seal without its spring, on the pump

shaft by pushing on the inside rubber portion of the

seal using water as the lubrication. The graphite seal

face should touch the white ceramic seat face. The

rubber bellows adhering to the pump shaft should

not protrude more than

⁄

in (1.6mm) beyond the

stainless steel ring located on the impeller side of the

seal.

6. Assemble the seal’s spring and the impeller, being

careful not to move the mechanical seal that has

been positioned on the pump shaft. Torque the

impeller bolt 16-18 ft-lbs (22-24 N-m).

7. Remove the three bolts and spacers. Using gun

grease, lubricate the gasket . Assemble the gasket

and suction housing using bolts, ﬂat washers

and locknuts. Torque nuts 16 - 18 ft./lbs.

Figure 57

Centrifugal Pump Assembly

11591

7 8

8 2 3 4

6 5

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 95 96

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Great-plains TSF1290 Operator Manual User Manual Page 69

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