Graco BULLDOG 204–287, Series K Instructions–parts list User Manual (English)

Questions and Answers:

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Charles RodriguezJul 31, 2025
How to fix a Graco BULLDOG 204–287 K Instructions–parts list Water Pump that fails to operate?
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  jessicahebertJul 31, 2025
  If your Graco Water Pump isn't operating, several factors could be at play. First, ensure that the fluid supply isn't exhausted; if it is, refill and reprime or flush the pump. Check for any restrictions in the line or inadequate air supply and clear them. Also, verify that the air pressure is sufficient and that air valves aren't closed or clogged. If the fluid hose or gun/valve is obstructed, clear it. If fluid has dried on the displacement rod, clean it. Lastly, inspect the air motor parts for dirt or wear.
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Alec GrahamAug 5, 2025
What to do if my Graco Water Pump operates but has low output on both strokes?
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  brucerogersAug 5, 2025
  If your Graco Water Pump operates but the output is low on both strokes, consider these possibilities: Check that the fluid supply isn't exhausted; if it is, refill and reprime or flush. Ensure there are no restrictions in the line or inadequate air supply, and clear any obstructions. Confirm sufficient air pressure and clear any closed or clogged air valves. Inspect the fluid hose or gun/valve for obstructions and clear them. See if the bleeder valve is open or worn and close or replace it. Check the inductor or ram plate seal for air leaking into the supply drum. If the fluid is too heavy for pump priming, use the pump bleeder valve. Finally, inspect for worn throat packings in the displacement pump and replace the gland/packing stack if needed.
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Jessica SalazarAug 11, 2025
Why is the speed of my Graco BULLDOG 204–287 K Instructions–parts list Water Pump erratic or accelerated?
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  Danielle GilbertAug 12, 2025
  An erratic or accelerated pump speed in your Graco Water Pump can stem from several causes. Check if the fluid supply is exhausted, and if so, refill and reprime or flush. It could also be due to fluid that's too heavy for pump priming. Another cause may be held open or worn piston valve or packings. Also, held open or worn intake valve or packings may be the reason. Finally, worn throat packings in the displacement pump might cause this issue, so replace the gland/packing stack.
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Dawn SmithAug 17, 2025
What to do if my Graco BULLDOG 204–287 K Instructions–parts list Water Pump's output is low on the downstroke?
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  Cheryl KimAug 18, 2025
  If your Graco Water Pump operates but the output is low on the downstroke, it could be due to fluid that is too heavy for pump priming, use the pump bleeder valve. Alternatively, the intake valve or packings might be held open or worn; in this case, clear the valve and replace the gland/packing stack.
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emyersAug 25, 2025
Why does my Graco Water Pump have low output only on the upstroke?
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  Suzanne RussellAug 25, 2025
  If your Graco Water Pump operates but has low output specifically on the upstroke, this could be due to a piston valve or packings that are held open or worn. To address this, clear the valve and replace the gland/packing stack.

Graco BULLDOG 204–287, Series K Instructions–parts list Specifications

General

Category	Water Pump
Type	Air-Operated Double Diaphragm Pump
Model	BULLDOG 204–287, Series K
Maximum Pressure	125 psi (0.8 MPa)
Air Inlet Size	1/2 in npt(f)
Materials of Construction	Aluminum