Comet APS51 Diaphragm Pump

APS51 three diaphragm pump with anodized aluminum construction.
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Comet APS51-MF shown here.

Comet APS51-MF shown here.

  • Comet APS51 Diaphragm Pump
    (APS51)
    USD $1,048.64
    • Buy 2 for USD $986.77 each and save 6%
    • Buy 6 for USD $944.82 each and save 10%
  • Comet APS51 Diaphragm Pump - VIP Next Day Delivery
    (APS51-Q)
    USD $1,119.33
  • Comet APS51-GR5 Diaphragm Pump with Gearbox
    (APS51GR5)
    USD $1,524.00
    • Buy 2 for USD $1,434.08 each and save 6%
    • Buy 6 for USD $1,373.12 each and save 10%
  • Comet APS51GR5 Diaphragm Pump w/ Gearbox - VIP Next Day Delivery
    (APS51GR5-Q)
    USD $1,680.02
  • Comet APS51-GR8 Diaphragm Pump
    (APS51GR8)
    USD $1,711.47
    • Buy 2 for USD $1,610.49 each and save 6%
    • Buy 6 for USD $1,542.03 each and save 10%
  • APS51-MF Diaphragm Pump
    (APS51-MF)
    USD $1,092.54
    • Buy 2 for USD $1,028.08 each and save 6%
    • Buy 6 for USD $984.38 each and save 10%
  • Comet APS51 Repair Kit
    (5026.0084)
    USD $188.33
    • Buy 2 for USD $177.22 each and save 6%
    • Buy 6 for USD $169.69 each and save 10%

Details

The Comet APS51 is a high pressure, three diaphragm pump made with anodized aluminum heads and is internally manifolded, making it great for many agricultural applications including lawn care, pest control, tree spraying, weed control, agricultural spraying, and hydrostatic testing.

Anodized aluminum construction allows resistance to many agricultural chemicals. Easily handles the pumping of herbicides, pesticides, liquid fertilizers, de-icing materials, and other hard-to-handle liquids. Perfect for medium to large dimension crop spraying and suitable for tractor or trailer mounted duster and sprayer applications.

APS51: Three diaphragm pump with universal drive face.

APS51-GR5: Three diaphragm pump with gear reduction for gas engines with 3/4" (19 mm) shafts. Includes pressure regulator with manual dump lever.

APS51-GR8: Three diaphragm pump with gear reduction for gas engines with 1" (25 mm) shafts. Includes pressure regulator with manual dump lever.

APS51-MF: Three diaphragm pump with universal drive face on front and 1-3/8" (35 mm) male 6-spline PTO shaft on back.

Note: If you have an existing APS51-GR5 or APS51-GR8 and you need to replace the pump, the gearbox can be reused and all you need to order is the plain APS51 pump.

  • Max. Flow: 14.5 gpm
  • Max. Pressure: 580 psi
  • Max. Pressure (APS51-GR5): 350 psi
  • Max. Rated Speed: 550 rpm
  • Max. Fluid Temperature: 104° F (40° C)
  • Min. Power: 5.2 hp
  • Port Sizes (APS51, APS51-MM): 1-3/8" inlet
  • Port Sizes (APS51-GR5, APS51-GR8): 1-1/4" inlet, 1/2" outlet, 1" bypass
  • Three semi-hydraulic diaphragms.
  • High pressure pump.
  • Anodized aluminum materials.
  • Pump Shaft Rotation: CW and CCW
  • Self-priming.
  • Can be run dry.
  • Large capacity oil bath crank case.
  • Adapts to PTO, gas engine, hydraulic motors, or belt drives.
  • Weight (APS51, APS51-MF): 36 lb
  • Weight (APS51-GR5, APS51-GR8): 44 lb

Recommended regulators for the Comet APS51 are the 1204.0678 and 1204.0670. If you need to replace the regulator on the APS51-GR5, then order the 1204.0680 and if you need to replace the regulator on the APS51-GR8, order the 1204.0678. Recommended gear reductions for this pump are the 5005.0216 and 5005.0221.

Repair Kit 5026.0084 Includes

  • 3 x 1800.0088 Buna Diaphragms
  • 6 x 1220.0035 Valve Assemblies
  • 6 x 1210.0047 O-Rings
  • 6 x 1210.0032 O-Rings

For more information about the Comet APS51, please view the files located under Related Information. You will find user manuals, a performance chart, parts list, and more.

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VIP Shipping

On our most urgently requested products, Rittenhouse offers VIP shipping. The overnight shipping price is included and we will do our utmost to get your order to you within the next business day. Applicable to the lower 48 states only (excludes Alaska and Hawaii).

  • You must order before 3:00 PM Eastern time (12:00 PM Pacific time).
  • Overnight shipping is included in the product price.
  • A Rittenhouse VIP manager will be responsible for following your order from receipt to delivery.
  • We will let you know immediately if there is a problem with your order.

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Related Information

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