Pentair STA-RITE DYNA-PRO, Installation And User Manual

7

DYNA-PRO

®

 Self-Priming Pool/Spa Pump Installation and User’s Guide

Pump Reassembly / Installing New Seal

IMPORTANT: 

The ceramic seal of the pump’s shaft seal 

must be clean and free of dirt, grease and dust before 
installing. 
1.  Wet the outer edge of the 

ceramic seal with a small 
amount of liquid detergent. 
Firmly and squarely press it 
into the seal plate cavity with 
your thumbs (see 

Figure 6

).

2.  If ceramic seal does not seat 

properly into the seal plate 
cavity, remove it and place the 
seal face up on a flat surface. 
Reclean the seal plate cavity 
and attempt to reseat the seal.

3.  If ceramic seal still will not seat correctly in the seal 

plate, place a cardboard washer over the ceramic seal 
and use a piece of 3/4” standard pipe to press the seal 
into place.

Note:

 Be sure not to scratch or mar the surface of the 

seal. If seal is damaged it will leak.

4.  Replace the slinger on end of the motor shaft so that 

the impeller sleeve will push it into position.

5.  Remount the seal slate onto the motor using the four 

(4) motor to seal plate screws. Torque the screws to 
60-80 inch-lbs. (69-92 kg/cm).

6.  Apply a small amount of liquid detergent to the inside 

diameter of the rotating seal member.

7.  Slide the rotating seal member, polished carbon face 

outwards, over the impeller sleeve until rubber drive 
ring hits the back of the impeller.

Note:

 Be sure not to scratch or mar the polished seal 

face. The seal will leak if damaged.

8.  Screw the impeller onto the motor shaft clockwise. The 

impeller will correctly seat the rotating seal  member 
on the seal plate.
For 2 HP, 2.5 HP and 3-Phase models, install the 
impeller gasket and lockscrew (left-hand thread). 
Torque the lock screw to 50-55 inch-lbs (57.6-63 kg/
cm).

Figure 6

9.  Mount the diffuser onto the seal plate with the seven 

(7) screws and washers. Torque screws to 10-14 inch/
lbs. (11.2-16.1 kg/cm).

10.  Assemble the motor and seal plate to the pump body 

with the seal plate to pump body hardware. Torque 
nuts to 120-130 in-lbs. (138-150 kg/cm).

11.  Reinstall the drain plug into the bottom of the pump 

body.

12.  Open all gate valves in the suction and discharge lines.
13.  Reconnect power to the pump at the circuit breaker.
14.  Prime the pump according to 

Priming the Pump

, on 

page 4.