Crane Weinman B Series, Installation And Operation Manual

7

4. DISASSEMBLY

The disassembly instructions apply to the series of pumps 
in general and may vary slightly on special units. If complete 
disassembly is not necessary, use only those steps which 
apply. Close gate valve in discharge and suction piping. 
Inspect all parts removed to determine whether suitable for 
reuse. It is recommended that all packing, gaskets and 
O-rings be replaced with new ones during reassembly.

NOTE: Special precautions must be observed when 
handling mechanical seals, so as not to damage the 
lapped faces of the seals.

Unless casing (1) or suction cover (9) is damaged, or it is 
necessary to replace suction cover wear ring (25), it may 
not be necessary to remove the suction and discharge 
piping to service the power end.

  a.  Remove drain plug (216) from casing or (231)

      from suction elbow.

  b.  Remove all cooling or lubrication lines.

  c.  Disconnect power supply to motor and remove 

      motor; coupling spacer or 

fl

 exible drive shaft, so

      that power frame assembly may be removed

      from the casing (1).

  d.  Remove casing cap screws (212) and packing

      box cover cap screws (334), where used and 

      separate power end from casing (1).

  e.  Remove impeller screw (26) by turning counter

      clockwise, washer (210), impeller screw gasket

      (28) and pull impeller (2) from the shaft with an

      impeller or wheel puller. Remove impeller key

      from the shaft, also shaft sleeve gasket (38).

PACKING BOX COVER (11)

  a.  With Packing (13): Remove gland nuts (210),

      or cap screws (282), gland clips (206) and gland

      (11). Packing box cover may be removed from 

      frame (19). Remove packing (13) and lantern

      ring (29) from packing box cover and clean the 

      bore of the cover.

  b.  With Mechanical Seal (89): Remove gland nuts 

      (210) and carefully remove packing box cover 

      from frame (19). Inboard stationary seal seat 

      can be pushed from the cover and outboard 

      stationary seal seat can be removed from seal 

      gland. Before removing seal rotating assembly, 

      depending on type of seal furnished, scribe a

      mark on sleeve to show location of spring 

      retainer, then seal rotating assembly may be 

      removed, being careful so as no to damage 

      sealing faces, O-ring, etc.

SHAFT SLEEVE (14)

The shaft sleeve is mounted on the pump shaft (6) by 
means of heat shrink 

fi

 t. To remove shaft sleeve, dismantle 

power frame as below, place shaft in a vise and proceed as 
follows:

  1.  With a hand grinder and a thin grinding wheel 

      (approx. 1/8” wide), cut a groove axially along the

      sleeve to the shoulder of the shaft. Grind the 

      groove as deep as possible without damaging

 the 

shaft.

  2.  After the groove has been cut, insert a wedge

      tipped cold chisel into the groove at the impeller

      end of the sleeve. Support shaft on a V block 

      under the sleeve. Tap chisel sharply with a hammer

      until crack occurs along the base of the groove.

  3.  Pry groove apart and remove sleeve from shaft.

FRAME (19)

  a.  Remove pump half of 

fl

 exible coupling and key

      (46) from pump shaft (6). Remove cap screws

      (213), cap screws (332) and jack screws (286)

      with adjusting lock nut (204) and pull bearing

      cover (37) and seal (49) from bearing housing (33).

  b.  Open tangs of lockwasher (69) and unscrew and

      remove bearing locknut (22) and bearing 

lockwasher 

(69).

  c.  Insert a small pry bar at several points under the

fl

 ange of the bearing housing (33) and carefully

      force the shaft (6) with bearing housing (33) 

      bearings (18 and 16) and grease retainer (51)

      from the coupling end of the frame (19).

  d.  Mark position of grease retainer on the shaft, 

      then remove grease retainer and bearing (16) 

      from impeller end of shaft. 

NOTE:

 To remove inner race roller bearing (16), carefully 

apply heat to the inner race until it can be pulled from 
shaft.

  e.  With bearing puller, remove bearing housing (33)

      and bearing (18) from coupling end of shaft. 

      Press bearing from the bearing housing.

  f.   Wash bearings, bearing housing and bearing 

      covers to remove old grease, also 

fl

 ush old 

      grease from frame (19). Press seals (41 and 49)

      from bearing covers (35 and 31) ad inspect for

 wear.

WEARING RINGS (8 and 25)

  a.  To replace suction cover ring (25), remove cap 

      screw (215) and suction cover (9) from casing (1).

      Remove machine screws (343) and then remove

      ring (25). Clean ring seat before installing new ring.

  b.  To replace impeller ring (8), (remove set screws

      (296) when used), place a wedge-tipped or 

      pointed cold chisel against the side of the ring 

      and tap chisel sharply with a hammer, forcing the

      ring from the impeller (2).

5. REASSEMBLY

FRAME (19)

  a.  Position grease retainer (51) onto the shaft (6) to

      position previously-marked and tighten set 

      screws. Press inboard ball bearing (16) onto the

      shaft until inner race is against shaft shoulder. 

      Apply fresh grease to the bearing (don’t over 

grease), 

fi

 ll chamber 1/3 full. 

  b.  Carefully press outboard ball bearing (19) into the

      bearing housing (33) until seated in the bottom 

      of the housing. Press bearing housing assembly 

      onto the shaft (6) until bearing inner race is 

      against shaft shoulder. Apply fresh grease to the 

      being and the housing.