Stow manual Stow SDP-2/SDP-3 Maintenance Pump

STOW SDP-2/SDP-3 — MAINTENANCE (PUMP)

Pump Vacuum Test

CAUTION:

DO NOT attempt to start the engine unless the pump has previously been primed with water. Severe pump damage will occur if pump has not been primed.

To perform the pump vacuum test do the following:

1.Remove the pump fill cap (Figure 2), and fill the pump with water.

2.Start the engine as outlined in the initial start-up section, and wait for the pump to begin pumping.

3.As shown in Figure 19 (next page), place a water hose inside the discharge opening of the pump, and turn on the water. This flow of water into the discharge opening will prevent the pump from running dry.

4.Place the Pump Vacuum Tester (P/N 7000030) over the pump suction (inlet) opening (Figure 19) with the vacuum gauge facing upwards. It may be necessary to apply a small amount of water around the rubber seal of the vacuum tester to make a good suction fit.

5.Check and make sure that there are no air leaks between the vacuum tester and the inlet port on the pump. If air leaks are present reseat vacuum tester.

6.Run the pump for a few minutes while monitoring the vacuum gauge. If the gauge indicates a reading between -25 and -20 in. Hg. (inches of mercury) then it can be assumed that the pump is working correctly.

25 in. Hg (inches of mercury)

NOTE translates into 25 feet of lift at sea level.

7.If the vacuum tester gauge indicates a reading below -20 in. Hg, it can then be assumed that the pump is not functioning correctly, and corrective action needs to be taken.

6.To test the flapper valve, shut down the engine. The vacuum tester should remain attached to the pump suction inlet port by vacuum. This indicates the pump's flapper valve is seating properly to hold water in the suction hose when the engine is stopped.This prevents backflow and allows for faster priming when the engine is restarted.

Pump Cleaning

After pumping water containing large amounts of dirt and debris, perform the following:

1.Remove the drain plug from the pump housing (Figure 2) and drain any water left in the pump.

3.Clean and remove dirt, debris from pump casing. Inspect impeller and volute for wear. Replace any damaged or worn parts.

Gear Reduction Oil (Transmission)

1.Change transmission oil after the first 40 hours of operation. Use SAE 80/90 EP gear oil. Transmission oil capacity is 1-1/4 pints (590 ml.). Check oil level periodically and change oil after every 400 hours of operation.

Connecting Rod Bearing Lubrication

1.Grease connecting rod bearing thru the access hole (Figure 7) every 25 hours of operation.

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

Connecting Rod Bearing Lubrication

1.Keep interior of pump and valves clean. Flush out pump with clear water after operation.

2.Remove connecting rod guard occasionally and wipe up excess grease from connecting rod bearing.

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 21