BLACKMER 111-F01, Installation, Operation And Maintenance Instructions

111-F00     Page 12/16 

MAINTENANCE: 

15. LOCKNUT ADJUSTMENT 

It is important that the bearing locknut (24A) and lock 
washer (24B) be installed and adjusted properly. Over 
tightening the locknut can cause bearing failure or a 
broken lock washer tang. A loose locknut will allow the 
rotor to shift within the pump, causing wear.  
See Figure 12. 

Figure 12 – Locknut Assembly 

a.  On the end of the pump shaft, install a lock washer 

(24B) with the tangs facing outward, followed by a 
locknut (24A) with the tapered end inward. Ensure the 
inner tang "A" of the lock washer is located in the slot 
in the shaft threads, bending it slightly, if necessary. 

b.  Tighten the locknut to ensure that the bearing is 

bottomed in the recess. DO NOT over tighten and 
bend or shear the lock washer inner tang. 

Bearing Adjustment  

16.  Turn the bearing adjuster counterclockwise, as viewed 

from the driven end of the pump, until the shaft is snug 
and no longer turns.  Mark a line across the bearing 
adjuster and drive housing. 

17.  Turn the bearing adjuster clockwise, as viewed from the 

driven end of the pump the distance prescribed per table 
2.  Measurement to be taken on outside of drive housing.  

Table 2 

Pump size 

Distance on OD of Drive Housing 

PV(S) 6,8 

3/4” (19.05 mm) 

18.  Tighten the bearing adjuster lock setscrews and torque 

per table 1. 

19.  Install a new head O-ring (72) on the dowel of the head 

as shown in Figure 13. 

Figure 13 – Head O-ring Installation 

20. 

Carefully install the head (23) into the cylinder.  

If pump 

is equipped with internal relief valve, orient the relief 
valve per instruction in PUMP RELIEF VALVE section 
of this manual. 

 Install and tighten four head cap screws 

(21A).  Torque per table 1.

21.  RELIEF VALVE ASSEMBLY 

a.  Insert the valve into the valve body with the fluted in 

inward. 

b.  Install the relief valve spring onto valve and spring 

guide onto spring. 

c.  Screw the adjusting screw into the valve cover until it 

makes contact with the spring guide 

d.  Install the relief valve cap and o-ring after the relief 

valve has been properly adjusted. 

NOTICE: 

The relief valve setting MUST be tested and adjusted 
more precisely before putting the pump into service.  
Refer to “Relief Valve Setting and Adjustment”. 

22.  Reinstall coupling, shaft key, and coupling guards.  

Do not operate 

without guard 

in place 

Operation without guards in place can 
cause serious personal injury, major 
property damage, or death. 

23.  Refer to “Pre-Startup Check List” and “Startup 

Procedures” sections of this manual prior to restarting 
pump operation.