Finish Thompson GP11 SERIES - Manual (Page 3)

3. remove the seal for inspection.
a. lubricate impeller’s shaft with rubber lubricant
emulsion or soapy water to allow the seal to slide
easier.
NotE: Never use a petroleum product for lubrication.
Doing so will effect the seal elastomer’s performance
after reassembly.
b. if no cooling collar is present, carefully remove the
retaining ring that holds the rear of the seal. if
equipped with a cooling collar, carefully slide the
cooling collar off of the impeller’s shaft.
• With single bellows or multi-spring seals, a
retaining ring holds the seal in place. Carefully
remove the retaining ring.
• With double seals, the cooling collar holds the seal
in place.
CAUtioN: the seal’s spring is compressed and under
pressure. Use care when removing.
c. remove the seal’s spring. grasp the rotating head of
the seal by hand and twist to remove from the
impeller’s shaft.
d. remove the housing cover from the impeller.
e. Press the ceramic stationary seat portion of the seal
out of the housing cover.
4. Visually inspect all parts for damage. replace any parts
that appear worn or damaged.
• look for scoring of the seal’s ceramic face.
• inspect the rotating seal face for wear.
• Check for degradation or chemical attack of any
elastomers and other seal components.
• look for signs of heat damage (melted plastic) to the
housing Cover and impeller’s shaft.
sEAl iNstAllAtioN & PUmP rEAssEmBly
Single Bellows Seal
1. install the stationary seal face.
a. lubricate the stationary face’s o-ring with a rubber
lubricant emulsion or soapy water. Keep the polished
surfaces of the seal face clean.
NotE: Never use a petroleum product for lubrication.
Doing so will effect the seal elastomer’s performance
after reassembly.
b. Carefully press the stationary face into the housing
cover (use a piece of cardboard to protect the seal while
pressing against the stationary face). the smoothest
side of the stationary face should be facing outward.
2. install the rotating face.
a. lubricate the impeller’s shaft with a rubber lubricant
emulsion or soapy water.
b. Carefully slide the housing cover over the impeller’s
shaft. the side of the housing cover with the pressed-
in seal face should be away from the impeller.
c. separate the rotating head of the seal from the large
spring. relubricate the impeller’s shaft, then carefully
slide the rotating head of the seal over the impeller’s
shaft using a twisting motion. the carbon side of the
rotating face should be toward and pressed against the
stationary head of the housing cover.
CAUtioN: the carbon portion of the seal is easily
damaged. take care not to apply uneven force or crack
the carbon while installing.
3. install the seal’s spring and spring retainer. Compress the
spring and snap the retaining ring (item #8) into the groove
on the impeller’s shaft.
4. install the assembled seal, impeller and housing cover onto
the motor bracket.
a. if a cooling collar is being used, slide it onto the
impeller’s shaft at this time. take care to align the
water connections so they are accessible.
b. screw the impeller onto the motor shaft or shaft
adapter.
c. make certain that the housing cover’s o-ring is in place.
d. Place the impeller housing into position and install the
hardware. tighten the six hex-head cap screws to 90
inch-pounds.
Multi-Spring Seal
the basic installation procedure for a multi-spring seal is the
same as for the single bellows seal. the exception is that a
multi-spring seal has 4 set screws which need to be tightened
on the impeller shaft.
Double Seal
1. remove the motor adapter from the motor’s face (the pump
has previously been removed).
2. install the stationary seal faces.
a. lubricate the stationary faces’ o-rings with a rubber
lubricant emulsion or soapy water. Keep the polished
surfaces of the seal face clean.
NotE: Never use a petroleum product for lubrication.
Doing so will affect the seal elastomer’s performance
after reassembly.
b. Carefully press the stationary faces into the housing
cover and the cooling collar (use a piece of cardboard
to protect the seal while pressing against the stationary
face). the smoothest side of the stationary face
should be facing outward.
NotE: if using a special seal material, it is vital that the
special stationary seal face is pressed into the housing
cover.
3. install the rotating faces and cooling collar to the motor
adapter.
3