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Customer Service Bulletin Vehicles 08-20 Page 1 of 7

Hardened Sprayer Pump Heads Multi Pro 5800/1750/Workman January 17, 2017

Customer Bulletin

Commercial Products

Vehicles

#08-20

Hardened Sprayer Pump Heads

Product: Multi Pro

January 16, 2017

Affected Units:

Multi Pro

5800 Base Gas

Multi Pro

5800 Base Diesel

Multi Pro

5800 Diesel

Multi Pro

5800 ExcelaRate Diesel

Multi Pro

5800 ExcelaRate Gas

Multi Pro

1750

Multi Pro

Workman

Models:

41594

41593

41593N

41393

41394

41188

41240

Serial Numbers:

315000001-316999999

311000001-316999999

313000001-314699999

316000001-316999999

314000001-316999999

Subject:

Hardened Sprayer Pump Heads

Situation:

Important Information

Premature spray pump head wear has been reported on some 6-piston spray

system pumps (Figure 1).

Figure 1

Material wear can be attributed to three causal areas.

1. Spray Pump Maintenance: Improper rinsing and neutralizing can

cause residual chemicals left in the 6-diaphragm system to drain

down and collect in the pump heads at the bottom of the pump. These

chemicals degrade the internal surfaces of the heads, diaphragms

and valve components.

Toro recommends a triple rinse every time the sprayer is used, along

with chemical appropriate neutralizers (identified by the chemical

manufacturer) for the particular chemical(s) being used. Refer to the

sprayer operator’s manual for additional product specific maintenance

information and requirements.

Summary of content (7 pages)

PAGE 1
Customer Bulletin Vehicles #08-20 Commercial Products Hardened Sprayer Pump Heads Product: Multi Pro January 16, 2017 Affected Units: Models: ® Multi Pro 5800 Base Gas Multi Pro® 5800 Base Diesel Multi Pro® 5800 Diesel Multi Pro® 5800 ExcelaRate Diesel Multi Pro® 5800 ExcelaRate Gas Multi Pro® 1750 Multi Pro® Workman Subject: Situation: Serial Numbers: 41594 41593 41593N 41393 41394 41188 41240 315000001-316999999 311000001-316999999 313000001-314699999 316000001-316999999 316000001-316999999 31
PAGE 2
. Spray Pump Cavitation: Cavitation can be the leading cause of pump head and diaphragm wear. When the suction is restricted, this can cause excess vacuum that will introduce air into the pump inlet. When these air molecules change from a vacuum state to a pressure state in the pump, they will cause damage to the surrounding surface area. Toro recommends sizing the suction and pressure filter accordingly to accommodate the viscosity of the chemical mixture being sprayed. For low viscosity (i.e.
PAGE 3
Instructions Vehicles #08-20 Situation: The original Hardi pump heads may wear prematurely. Replace them with the upgraded hardened pump heads to increase the life of the pump. The new heads are gray in color and are a different design than the older heads they are replacing. Note: Inspect the condition of the diaphragms and the inlet and outlet valves of each cylinder while the pump heads are removed. If the diaphragms and/or valves are worn, rebuild the pump using rebuild kit P/N 120-0796.
PAGE 4
2. Remove and replace one pump head at a time. Begin the upgrade with the top two pump heads, as they are connected with the lift bracket. See Figure 2. Figure 2 Note: One corner of each of the two upper pump heads is secured to the pump with a longer bolt than the other corners to compensate for the thickness of the lift bracket. 3. Transfer the inlet and outlet valves from the old pump head to the new pump head.
PAGE 5
4. As you install each successive new pump head, turn the pump crankshaft to move each diaphragm to its lowest position. There should be no gap between the diaphragm and the surface of the pump case. See Figure 4. Figure 4 1. Diaphragm gap, indicating incorrect crankshaft position 2. Diaphragm is flush with pump case surface, indicating correct crankshaft position 5. When installing a pump head, ensure the inlet and outlet valves remain seated in their proper position.
PAGE 6
Note: The new pump heads have a lift hook feature cast integrally into them. When viewed from the driven side of the pump, the lift hooks should all be facing in a clockwise direction. See Figure 6 . Figure 6 1. Pump drive 2. Pump head lift hook 6. Install the four fasteners and tighten them in a crisscross pattern to 45–55 ft.-lbs. (61–75 Nm). 7. Once the top two heads have been replaced, move to the heads on either side of the pump. 8.
PAGE 7
Figure 7 1. 2. 3. 4. 5. Pump foot bracket Long pump head bolts Short pump head bolts Long pump head bolts Short pump head bolts 9. When the installation of the new pump heads is complete, the pump assembly can be installed back into the machine. Before operating the pump, refer to the appropriate service manual for step-by-step instructions on pump installation and proper priming, based on your specific model.