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Startup
Prior to starting the pump double check the following.
• Pressure and vacuum gauges should be installed as close as possible to the pump
• Rotate pump shaft to ensure it turns freely without binding
• Recheck alignment and ensure all guards are in place
• Make sure piping is independently supported and no strain is being transmitted to the pump
• Make sure the safety relief valve is installed correctly
• Check pump rotation
• Open suction and discharge gate valves
• Check for any leaks once gate valves are open
CAUTION
The pump should not be run dry. If after approximately 60 seconds there is no discharge of liquid, stop the pump and investigate the
possible cause. Failure to comply with this could cause severe damage to internal seals, bushings and/or metal parts.
WARNING
Failure to follow these instructions could result in serious bodily injury or death. Do not attempt to work on any Tuthill pump installation
before completing the steps below. Disconnect the drive so that it cannot be started while work is being performed. Review the Material
Safety Data Sheet (MSDS) applicable to the liquid being pumped to determine its charaacteristics and the precautions necessary to
ensure safe handling. Vent all pressure within the pump through the suction or discharge lines. All Tuthill pumps contain residual ISO
32 lube oil from the factory production test. Determine if this is compatible with the fluid you are pumping. If the fluid is incompatible
please consult factory directly.
Disassembly of Seal
The seal assembly of the pump may be changed without the disassembly of the rest of the pump.
1.
Deburr shaft especially around the keyway area.
2.
Hold the pump in a vice, cover down and remove the grub screw from the lockable shaft bearing collar. Remove collar.
3.
Unscrew the 3 off 6mm bolts to remove the bearing housing, (this may be tight due to the sealant used during assembly). This can
be done by holding the bearing housing and twisting the body.
4.
Remove static seal plate from bearing housing, noting dowel pin in plate location face, and place to one side.
5.
Undo the three grubscrews on the mechanical seal collar and gently pull off shaft, again put to one side. (Remove secondary collar
if there is one present.) Press out the seal housing bearing.
6.
Inspect rotor, if badly scored in seal or bearing area, rotor should be replaced. Also check seal faces for the same scoring. Remove
0-rings and check for deformation, again replace if there is any doubt.
7.
Clean all parts thoroughly and replaced static seal plate ensuring that the plate is positioned correctly over the dowel.
8.
Refit collar to the shaft, using a 0.002” feeler gauge between the collar and flange (if it originally had one fitted). Lubricate 0-ring
inside the mechanical seal with a light oil and guide down the shaft. If the pump had a collar then push the mechanical seal down
onto the collar and retighten the three grubscrews, if the pump did not have a collar then use a 0.002” feeler gauge between the
flange and the mechanical seal to create the correct end float. And retighten the three grub screws.
9.
Apply the new bearing housing gasket and refit the bearing housing.
10.
Press in the lockable bearing. Take the lockable collar and place over bearing ensuring that it is fully located and while holding the
collar rotate the shaft clockwise. Take a 3/16th pin punch and gently tap the collar counterclockwise until the grubscrew lines up with
the indentation on the shaft and then retighten.
