moyno Version 3, Service Manual

Figure 4-2. Packing Removal Tool 

 
4. If drive shaft is not worn, install three rings of packing, 

the lantern ring halves, and four more rings of packing; lubri-
cating them before installation with a good grade of packing 
grease. Be sure to stagger the packing ring joints at 90° in-
crements. (See Section 4-35.) 

CAUTION:  Always use a proper

packing tamper tool to 

install packing. Do not use a pointed or 
sharp tool

, 

as damage to the packing mate-

rial or drive shaft could result. To assure 
proper

shaft lubrication, never use a one-

piece spiral wrap packing. 

 
5.  Replace packing gland and secure with packing gland 

nuts. (See fig. 4-1.) 

 
6.  Adjust packing per Section 4-3. 

4.5. LUBRICATION 

4.6. Bearings. 

The bearings are lubricated at the factory 

and will only need to be re-lubricated when the shaft/bearing 
assembly is removed from the pump. (See Section 4.34.) 

 
4-7. Gear Joints. 

Both gear joints are packed with lubri-

cant during assembly, and will only need to be re-lubricated 
when gear joints are disassembled. (See Section 4-34.) 

 
4-8. G-3 Oilers.

 Ensure that both oilers (item 1, fig. 4-10) 

are filled with a suitable SAE 30 or 40 weight oil. 

4-9. DISASSEMBLY OF G2 OPEN THROAT PUMP 

Note:  In the following G2 disassembly instructions, the part 

reference numbers are from fig. 4-7. 

Note: The following instructions cover ONE procedure for 

disassembling all pump components. Major pump 
components can be disassembled in various ways 
since specific installation location limitations will de-
termine method of component removal. 

4-10.  Disconnect Pump 

 
1.  Operate pump (preferably with clean water) to insure 

rotor and stator are not dry. 

 
2.  Shut off pump. 
 
3.  Close suction and discharge valves. 
 
4. Turn off flush water to packing or mechanical seal,  

if used. 

 
5.  Disconnect power source. 
 
6.  Drain any fluid in pump. 
 
7.  Remove inspection plate (17) and gasket (18). 

Page 5 

4-11. Packing Removal 

1. Stop pump. 
 
2.  Complete Section 4-10, steps 2 - 6.

3.  Remove gland adjustment nuts (E) and gland halves 

(12) from stuffing box. 

 
4.  Remove packing rings (10). This is best done by using 

flexible packing extractors (see fig. 4.2). Use two extractors 
simultaneously on opposite sides of each ring. Pull evenly. 

 
5.  Remove lantern rings (13) in similar fashion. Twist split 

rings to remove from shaft. 

 
6.  Remove additional packing rings. 
 

4-12. Stator Removal 

1.  Complete Section 4-10. 
 
2. Remove

section of discharge pipe attached to dis-

charge flange (45). 

 
3. Remove discharge

flange (45) by unbolting from stator 

clamp ring (40B) and remove stator gasket (42). Remove 
stator retaining ring (43) and stator clamp ring (40B) from 
stator (44). 

Note: Omit above step 3 when using following method 6a to 

separate rotor and stator. 

 
4.  Remove top half of stator support (41). 
 
5. Unbolt stator clamp ring (40A) from adapter flange  

(21) and suction housing (19). Remove stator gasket (42). 
Use a screwdriver tip to carefully remove stator retaining  
ring (43). (See fig. 4-3.) Remove stator clamp ring (40A) 
from stator (44). 

Figure 4-3. Typical Retaining Ring Removal 

6. Pull stator

(44) off rotor (37). 

Note: On multiple stage pumps, or when also cleaning, 

checking or changing stator (44), rotor (37) and/or 
gear joint assembly, one of the following procedures 
is suggested. 

 
6a. Use winch-type device if anchored directly opposite 

stator end. Attach cable to discharge flange (45) to pull sta-
tor (44) off rotor (37).