Multi Pro 1750Page 6 − 16Spray System
3. To separate the pump castings:
A. On crankshaft end with grease fitting, place
spacer or socket on crankshaft.
B. Using dead blow hammer, tap the spacer to sepa-
rate the pump casting from the pump housing.
C. Once a gap is created between the pump housing
and casting, carefully pry pump castings apart.
4. Remove connecting rods and inspect the rod bear-
ing surfaces which should be clean and smooth. Re-
place any of the connecting rods that have evidence of
scoring, wear or damage.
5. Remove crankshaft with metal spacers (item 21),
bearings (item 22) and counterbalance halves (items 23
and 24) from pump casting.
6. Press ball bearings from crankshaft, pump housing
and pump casting. If necessary, remove counterbal-
ance halves (items 23 and 24) from crankshaft.
7. Remove seals (item 14) from pump castings.
8. Clean crankshaft and internal surfaces of pump cast-
ings.
9. Pack new bearings with #2 general purpose lithium
base grease.
10.Press new bearings into pump housing and casting.
11.Install connecting rod bearings on crankshaft:
A. If counterbalance halves (items 23 and 24) were
removed from crankshaft, install the counterbalance
halves onto the crankshaft.
B. Pressing on bearing inner race, install first con-
necting rod bearing onto crankshaft. Then press sec-
ond bearing onto crankshaft.
12.Install seals into pump housing and casting. Seal
face should be flush with casting.
13.Position the pump housing (item 16) on a flat work
surface with the seal end down.
14.Place metal spacer (item 21) and then crankshaft as-
sembly into pump housing. Make sure that end of crank-
shaft with the grease fitting is inserted into the housing.
15.Using marks made during disassembly to identify
connecting rod locations, install connecting rods to
crankshaft. Makes sure that rod flange fits under metal
spacer that is installed in housing.
16.Place second metal spacer onto crankshaft and con-
necting rods and then install pump casting. Make sure
that pump inlet and outlet ports are positioned as noted
during disassembly (Fig. 7).
17.Secure pump castings with three (3) hex bolts.
Torque bolts from 60 to 72 ft−lb (82 to 97 N−m). After
assembly, check that pump crankshaft turns freely.
Assembly (Fig. 5)
1. Install diaphragms to connecting rods:
A. Place diaphragm back disc (item 8), new dia-
phragm (item 7) and diaphragm disc (item 6) on con-
necting rod. Make sure that the diaphragm disc lip
faces away from the diaphragm.
B. Thread hex bolt (item 5) into connecting rod.
C. Rotate crankshaft so the diaphragm is in the up
position and then torque the hex bolt 45 ft−lb
(60 N−m).
D. Repeat for remaining diaphragms.
IMPORTANT: The two (2) pump inlet valves in the up-
per pump positions (either side of pump suction
port) are different than the rest of the valves used in
the pump (Fig. 6). These two (2) valves can be identi-
fied by the vent hole and white color.
NOTE: Pump bracket (item 3) is secured to pump with
two (2) longer bolts on upper valve covers. Pump foot
(item 17) is secured to pump with four (4) longer bolts on
lower valve covers.
2. Install valves and valve covers:
A. Position new valves (inlet and outlet) and O−rings
to pump castings. Inlet valves should be installed
with the spring up. Outlet valves should be installed
with the spring down into the pump casting.
B. To make sure that diaphragm lip fits properly in
valve cover, rotate crank shaft so that diaphragm is
positioned between the center and top of its travel.
C. Place valve cover over valves noting orientation
of cover inlet and outlet. Make sure that diaphragm
lip, valves and O−rings fit into recesses in valve cov-
er. It may be necessary to
D. Secure valve cover to pump using hex bolts (4 per
cover). Torque bolts from 50 ft−lb (70 N−m).
E. Repeat for remaining valve covers.
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