cylinders are properly positioned in the recesses top
(p) Retighten cap screws alternately and
evenly until the parts are snugly seated.
(4) Servicing the pump valves.
(a) Remove the cap screw and clamp bar
from the rear of the valve chamber and lift out the
valve covers and O-rings attached.
(b) Remove the discharge valve springs and
seat assemblies and valve cages.
(c) Insert the round end of a valve seat puller
thru the opening at the center of the valve seats and
loosen seats from the valve chamber with a rocking
motion of the tool.
(d) Remove the valve seats from the recesses
with opposite end (curved end) of tool.
(e) Repeat the four preceding steps to remove
the suction valve parts which are identical to the
discharge valve parts and are located immediately
under them in the valve chamber.
(f) Clean all parts and inspect them. Replace
all worn parts as needed.
(5) Reassembling the value parts.
Valve seats may be used either side up, thus, if one
side shows wear, the opposite side may be used to
provide a new seat.
(a) With the O-ring in place on each valve
seat, place a few drops of light oil on the ring and
seat. Place each squarely in the bottom of the recess
in the valve chamber.
(b) Place the valve cages on the valve seats
and the springs and disk assemblies inside each cage.
(c) Repeat steps (a) and (b) to install the
outer discharge valve parts.
(d) Place the valve covers (with O-rings on
bottom groove) over each valve assembly.
(e) Replace clamp bar and cap screw.
Tighten the cap screw only snugly as over-tightening
can damage valve parts. Use 12 to 15 foot-pounds
(6) Servicing the crankshaft.
(a) Remove pipe plug and drain oil from
(b) Disconnect piping and remove pump from
(c) Remove cap screws, cup washers and
mounting base carefully to protect gasket.
(d) Remove cap screws from the connecting
rod assemblies. Use a center punch or other suitable
instrument to mark caps and rods for proper
rematching when they are reassembled.
(e) Remove oil slinger from the crankshaft.
(f) Push the connecting rods and crosshead
assemblies into the pump case to clear the
(g) Remove the driven sheave from the
(h) Remove snaprings.
(i) Place a wood block against either end of
the crankshaft and drive the shaft from the pump
Never pound directly on bearings when removing
or replacing them on the crankshaft. A block of
wood, with a suitable sized opening or block
supports to assure reasonable equal support
around the bearing, in a press is best for this
(j) After inspecting and replacing all worn
parts, press new bearing (if needed) against the
shoulders on the crankshaft.
assemblies in place in the pump case, place the oil
seals, carefully, over the ends of the crankshaft
with the lip of the seals facing the inside of the
(l) Seat the snaprings in grooves in the
bearing housings against the oil seals and tap the
crankshaft to allow a slight end play in the
(m)Reassemble the connecting rods and
crosshead, being sure to rematch the rod and cap
properly as marked when disassembled.
(n) Complete the reassembly by reversing
steps (a) through (h), being sure to replace drain
(o) Remove ¾" fill plug and fill the
crankcase with clean SAE 20 non-detergent oil to
the filler plug level.
(p) Turn the pump a few revolutions by
hand to be sure all parts are running freely before
using the pump.
(7) Servicing the crossheads.
(a) Remove the valve chamber, cylinders
and plunger packings as described in paragraph (3),
servicing the plunger packings, steps (a) and (b).
(b) Remove O-ring seal, back-up washer
and the crosshead umbrellas.
(c) Remove the mounting base and the
connecting rods as described in paragraph (6),
servicing the crankshaft, steps (a) through (d).
(d) Turn the crankshaft by hand to allow
removal of the crossheads, being sure that all parts
are reassembled in the exact former position.
(e) Reverse steps (a) through (c) when
reassembling the crossheads, being sure that all