Toro Multi Pro 5800 Service Manual page 191

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 15) and seals (item 16) 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 on pump housing.
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 are white.
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. 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.
Crankshaft Bearing Service (Fig. 5)
1. For assembly purposes, use marker to identify loca-
tion of all connecting rods.
2. Remove three (3) hex bolts that secure pump casting
halves together.
Multi Pro 5800
2
1. Pump suction port
2. White check valve
1. Suction port
3. To separate the pump castings:
A. On crankshaft end with grease fitting, place
spacer or socket on crankshaft.
B. Using deadblow hammer, tap the spacer to sepa-
rate the pump castings.
C. Once a gap is created between the castings,
carefully pry pump castings apart.
Page 6 - - 13
3
2
Figure 6
3. Pump bracket
4. Pump foot
1
2
Figure 7
2. Supply port
Spray System
1
4