Gardner Denver Single Acting Pump PZ-7

1. Remove valve covers and gaskets. Replace if cut or warn.

2. Check fluid valves and seats for wear. Replace cut or worn inserts and valves.

3. Inspect urethane bushing in suction and discharge valve guides and replace if worn.

4. Inspect piston locknut. Replace if damaged, corroded, or if nylon locking insert has lost its effectiveness. Nut should be used only three times and then replaced. Do not overtighten nuts.

1. Remove valve cover locks. Clean threads on locks and rings. Coat threads with moly coat thread compound or heavy–duty lead base thread compound. Replace if they are worn or cracked.;

1. Check all fluid cylinder studs and nuts for tightness.

2. Remove and clean discharge cross strainer.

3. Check condition of oil stop head seals and replace if worn or leaking excessively.

1. Replace oil stop head seals even though leakage is not evident.;

Warning: This procedure requires trained personnel with PPE!

Examine the suction and discharge valves for wear or damage

Describe any worn or damaged parts found

Check the condition of the inserts

Warning: Use the Gardner–Denver puller powered with a hydraulic jack when removing a worn valve seat

Clean the tapered bore in the valve seat deck of the cylinder with a wire brush

Ensure the valve seat tapered surface is clean and dry before assembling in cylinder deck

Check the alignment of the discharge valve seats

Install the new seat in the bore

Clean frame oil drain magnet during oil change

Clean frame oil drain plug magnets located in front of crossheads and clean the oil passage

Clean inside frame during regular oil change

Sign off on the pump maintenance

Inspect condition of piston and liners. They should be run until leakage of fluid is visible or becomes excessive.

Clean and refill piston wash tank after excessive contamination.

Check piston wash baffle, make certain nozzles are not clogged.

Check pulsation dampener for proper charge.

Sign off on the daily pump maintenance