Toro Multi Pro 1750 Service Manual page 189

Disassembly (Fig. 5)
IMPORTANT: Make sure to remove and neutralize
chemicals from pump before disassembly. Wear
protective clothing, chemical resistant gloves and
eye protection during pump repair.
1. Remove plugs (item 13) and seals (item 12) from
pump to allow all fluid to be drained from pump. Install
seals and plugs after draining is complete.
2. Thoroughly clean exterior of pump.
3. For assembly purposes, use marker to identify loca-
tion of all valve covers (item 4) on pump housing.
NOTE: When servicing the pump, it is recommended
that all diaphragms and pump valves be replaced to en-
sure correct pump operation.
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.
4. Remove hex bolts that retain valve covers (item 4) to
pump. Separate and remove valve covers from pump.
NOTE: The two (2) pump inlet valves in the upper 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 identified by the vent hole
and white color.
5. Remove and discard all valves (inlet and outlet) and
valve O−rings from pump. During valve removal, note
location and orientation of valves.
6. Remove hex bolt, diaphragm disc, diaphragm and
diaphragm backing disc from each connecting rod. Dis-
card all diaphragms.
IMPORTANT: If pump sealing surfaces are not thor-
oughly cleaned, leakage can occur that will ad-
versely affect pump operation.
7. Thoroughly clean valve, diaphragm and O−ring
seats in the valve covers and pump valve chambers.
8. If fluids are evident in crankcase, make sure that
crankcase is drained and that crankshaft is greased
thoroughly. Also, make sure that drain hole in bottom of
pump is not blocked.
9. Check the crankshaft for sufficient grease. Also,
visually inspect crankshaft assembly for any signs of ex-
cessive wear or damage. Check that crankshaft turns
freely. If crankshaft bearings are loose, rough or worn,
crankshaft bearings should be replaced.
Multi Pro 1750
2
1. Pump inlet
2. Pump valve (with hole)
2
1. Pump inlet
2. Pump outlet
Crankshaft Bearing Service (Fig. 5)
1. For assembly purposes, use marker to identify loca-
tion of all connecting rods. Also, note orientation of
pump housing and pump casting to ensure that pump in-
let and outlet are properly positioned during assembly
(Fig. 7).
2. Remove three (3) hex bolts (item 27) that secure
pump casting halves together.
Page 6 − 15
3
2
1
4
Figure 6
3. Pump bracket
4. Pump foot
3
1
4
Figure 7
3. Pump bracket
4. Pump foot
Spray System