Mechanical seal to prevent water

SETUP

CAUTION - Strainer

The strainer should be positioned so it will remain completely under water. Running the pump with the strainer above water for long periods can damage the pump.

CAUTION - Flammable Fluids

DO NOT pump flammable fluids, corrosive chemicals or fluids containing toxic substances. These fluids can create potentially dangerous health and environmental hazards. Contact local authorities for assistance.

Diaphragm pumps will handle fluids containing considerable solids (see

NOTE Table 1 for maximum solids diameter), however, if the mixture is too heavy to be pumped, water must be added until the mixture becomes sufficently fluid for pumping.

Connecting Rod Bearing Lubrication

1.Grease connecting rod bearing thru the access hole (Figure 8) every 25 hours of operation.

2.Use only premium lithium based grease, conforming to NLG1 Grade #2 consistency.

This pump uses a water-cooled

NOTE from seeping into the engine. The passage of water through the pump casing lubricates the seal and prevents it from overheating.

Gear Reduction Oil (Transmission)

1. Remove the transmission oil level plug (Figure 7). If oil begins to seep out as the plug is being removed, then it can be assumed that the transmission oil is at the proper operating level.

2.If oil does not seep out as the oil level plug is being removed, then remove the transmission oil fill plug and fill with SAE 80/90 EP (API GL-5) gear oil to the proper operating level. Transmission oil capacity is capacity is 22 ounces (651 ml).

Figure 8. Connecting Rod Bearing Lubrication Helpful Hints

The capacity of this diaphragm pump will vary greatly depending on the height of the suction lift and length of the discharge hose. A discharge hose which is too small, long or high will cause the following:

■Excessive bulging of diaphragm on the down stroke.

■Valves closing with a loud snap.

■Rough operation.

■Engine overloads and slow downs.

■Reduced efficiency.

Figure 7.Transmission Oil Level

MQD2H/3H DIAPHRAGM PUMPS — OPERATION AND PARTS MANUAL — REV. #6 (10/27/11) — PAGE 17

MQD2H specifications

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