BLACKMER 111-F01, Installation, Operation And Maintenance Instructions

111-F00     Page 9/16 

MAINTENANCE:  

PUMP DISASSEMBLY 

NOTICE: 

Follow all hazard warnings and instructions provided in 
the “Maintenance” section of this manual. 

NOTE: 

The numbers in parentheses following individual parts 

indicate reference numbers on the Pump Parts List. 
 
1.  Flush the pump per instructions in this manual. Drain and 

relieve pressure from the pump and system as required. 

2.  Starting on the inboard (driven) end of the pump, clean 

the pump shaft thoroughly, making sure the shaft is free of 
nicks and burrs. This will prevent damage to the 
mechanical seal when removed. 

3.  Remove the head cap screws (21). Gently pry the head 

away from the casing using two large screwdrivers. The 
head O-ring should come off with the head assembly. 

4.  Remove locknut and lock washer (24A and 24B):  

a.  Bend up the engaged lock washer tang and rotate the 

locknut counterclockwise to remove it from the shaft. 

b.  Slide the lock washer off the shaft. Inspect the lock 

washer for damage and replace as required. 

5.  Remove the rotor and shaft (13) from the casing.  While 

one hand is pushing the shaft, the other hand should be 
cupped underneath the rotor to prevent the vanes (14) 
and pushrods (77) from falling out.  As the rotor & shaft 
are removed further, carefully support the shaft so it does 
not drop and damage the sleeve bearing or finished 
surfaces of the shaft or the rotating seal face as it is 
removed.  Carefully set the rotor and shaft aside for future 
vane replacement and reassembly.  

6.  To remove the cylinder.  Lay the pump on end with the 

bearing housing facing upward and remove the 4 cap 
screws (21). Lift off the bearing housing and remove the 
cylinder O-ring (71).  

7.  The mechanical seal rotating assembly will come out with 

the shaft.  The stationary seat and stationary seal ring 
need to be removed from the bearing adjuster (188). 

8.  Carefully pry the stationary seal elements (153A) from the 

bearing adjuster (188).  Be sure not to scratch the seal 
face or damage the elastomer seal seat. 

9.  Remove the ball bearing adjuster (188) by loosening the 

set screws (189) and turning it counter clockwise with a 
strap wrench or spanner wrench. 

10. If necessary for replacement, remove the ball bearing 

(24C) from the bearing adjuster. Turn the bearing adjuster 
so the threaded side is up. Using an appropriately sized 
arbor press remove the bearing (24C) from the bearing 
adjuster.  Discard old bearing and replace with new one.  
See step 2 of “PUMP ASSEMBLY” 

11. If the sleeve bearing is worn or damaged. 

a.  Remove the sleeve bearing (24) from the bearing 

housing (57) using an appropriately sized arbor press.   

12. 

Only disassemble rotor & shaft if necessary for part 
replacement

.  Disassemble the rotor (13B) and shaft 

(13A) by removing the six cap-screws (13C).  See figure 
7. 

Figure 7  

PARTS REPLACEMENT 

1.  If any of the O-rings have been removed or disturbed 

during disassembly, they need to be replaced with new 
O-rings.  

NOTE: 

PTFE O-rings should be heated in hot water to aid 

installation. 

2.  Excessive or continuous leakage from around the seal 

housing or in the bearing housing may be an indication of 
a damaged mechanical seal. If a mechanical seal has 
been leaking, it is recommended the entire seal be 
replaced.  Refer to "General Pump Troubleshooting" for 
possible causes of seal leakage. 

3.  Inspect bearings for wear and replace as necessary.