John Deere — Priming the Pump
Operation · Pump / suction line
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Do not run the pump unless it is completely filled with liquid; danger of damaging the Mechanical Seal which depends upon the liquid for its lubrication.
Procedure
- Fill the suction line and pump completely with liquid before starting.
- Never run the pump dry.
- Mount non-self-priming pumps below the level of the liquid; suction line should slope down to the pump.
- If a pump cannot be mounted below liquid level, install a foot valve and prime by filling the pump full.
- Install a vent line (1/4" vinyl tubing) from the top plug in the pump casing up into the tank.
- On self-priming models, remove the Top Vent Plug and fill the priming chamber; flush and drain after use.
Specs & values
- Use John Deere Spraymaster Vent Line Kit PM34300456.
Source: John Deere service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.