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Disassembly (Fig. 9)
IMPORTANT: Make sure to remove and neutralize
chemicals from pump before disassembly. Wear
protective clothing, chemical resistant gloves, and
eye protection during pump repair.
NOTE: Many pump components can be easily re-
versed. During disassembly, make note of component
position (e.g. crankshaft, valve chamber) to assure cor
-
rect assembly.
1. Remove two (2) hex bolts that retain valve chamber
to pump. Separate valve chamber from pump.
D. Position dust plate and felt seal on both ends of
crankshaft.
IMPORTANT: If connecting rod position is incor-
rect, pump will not operate properly.
E. Slide crankshaft assembly into pump casing. The
rear connecting rod should be positioned to the left
side and the connecting rod closest to you to the right
side (Fig. 10).
2. Place second pump casing onto assembly. Pump
casing surfaces should mate together.
2. Remove inlet and outlet valves and o–rings from
each diaphragm cover. Note orientation of valves. Dis
-
card valves and o–rings. Clean valve and o–ring seats
in the valve chambers and diaphragm covers.
3. Remove hex bolts that secure diaphragm covers to
pump. Remove diaphragm covers.
4. Remove hex bolt, washer, nylon washer, diaphragm,
and diaphragm back disc from each connecting rod.
Discard diaphragms.
5. Remove five (5) hex bolts and nuts that secure pump
casing halves together. Note location of two (2) longer
hex bolts. Carefully separate pump casing halves.
1
2
Figure 10
6. Clean grease from bottom of housing and check con-
1. Closest connecting rod (to right side)
dition of bearings on crankshaft. If bearings require re-
2. Rear connecting rod (to left side)
placement, remove and disassemble crankshaft:
A. Remove crankshaft assembly from pump casing.
B. Slide felt seal and dust plate from both ends of
crankshaft.
C. Loosen bolt and hex nut that secure connecting
rods to crankshaft. Slide connecting rods from crank
-
shaft.
D. Press ball bearings from crankshaft.
Assembly (Fig. 9)
1. If disassembled, assemble crankshaft.
Figure 11
1
2
2
1
1
A. Hand pack new bearings with #2 general purpose
lithium base grease.
1. Hex bolt (30 mm long) 2. Hex bolt (55 mm long)
B. Pressing on bearing inner race, install two con -
necting rod and two crankshaft ball bearings onto
crankshaft.
C. Slide connecting rods onto rod bearings. Offsets
of the connecting rods should face each other. Install
hex bolt, flat washers, and hex nut to connecting rod.
Torque hex nuts to 25 ft–lb (34 N–m) to secure con
-
necting rod to crankshaft.
Multi Pro 5700–D
Page 6 – 13
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