Section 5 Corrective Maintenance; Packing Replacement - Milton Roy PRIMEROYAL Instruction Manual

PACKING REPLACEMENT:

The V-Type (Chevron style) packing rings are provided as a set. The set includes the lantern
ring, V-rings, seal ring, o-ring and spring. In some cases, a separate kit of V-rings and other
soft seal parts (not including the metal parts) may be purchased.
The liquid end must be removed from the pump to replace the packing set. Flush liquid end
of process liquid. Disconnect suction and discharge lines. The hex head pipe plug (1720) in
the end of the liquid end connects to the process cavity, and need not be removed (the hole
connects to the packing cavity providing continuous venting).
1. Unscrew the plunger adapter (1610) and move it away from the crosshead, and the bolts
fastening it to the pump housing.
2. Measure and record the length of plunger protruding from the liquid end.
3. Withdraw plunger from liquid end. Inspect plunger and the inside of the liquid end. Both
areas must be free from streaks (longitudinal groves) and other irregularities. Also replace
any scored or corroded plungers.
4. Clamp the liquid end in a vise and loosen the packing follower retaining nut (1660),
expecting the internal spring to push the packing parts outward.
CAUTION, the spring force may suddenly loosen stuck packing, causing it to fly out of
the liquid end. (The same precaution must be used during the re-installation).
5. Thoroughly clean the liquid end body of old packing, contamination and lubricant.
6. The metal parts: lantern ring, spring etc. may be re-used if they are in good condition. The
V-rings and seals are typically replaced.
7. IT IS IMPORTANT TO PACKING LIFE to soak the packing rings in the normal packing
lubricant prior to installing them in the pump, to reduce friction and aid the break-in process. If
packing grease is used, work some grease into each ring before assembly. Also coat the
inside of the liquid end with the same lubricant.
8. Replace ALL packing parts as shown in figure 4. Proper packing compression and minimized
leakage require use of the packing components as designed. Begin assembling the components
one ring at a time.
SECTION 5
CORRECTIVE MAINTENANCE
Packing Replacement
(Spring loaded, Non-Adjustable packing type only, Figure 4).
1 3