New-Style Jenny K Air Compressor Pump Replacement, Complete Assembly, Single-Stage, 3/4 - 2 HP #058C9F

New-style Jenny "K" replacement pump assembly with single-groove flywheel and air filter assembly. Usually for stop/start applications.

Same as the "KU" pump, except this pump is for serial numbers starting with "G" and does not have head unloaders. Made in the USA. 

Note: Crankcase is 1" taller to hold more oil. Do NOT order this pump for older units as it would require a new belt guard assembly since the crankcase is taller.

Need oil? Click here for synthetic and synthetic-blend air compressor oil to keep your compressor running like new for years to come.

CFM output is dependent upon the horsepower of the motor/engine:

• 3/4 HP = 2.7 CFM @ 100 PSI (Delivered)
• 1 HP = 4 CFM @ 125 PSI (Delivered)
• 1 1/2 HP = 6.2 CFM @ 125 PSI (Delivered)
• 2 HP - 8 CFM @ 125 PSI (Delivered)
• 5.5 HP (Gas) = 8.6 CFM @ 125 PSI (Delivered)

• HP Rating: 3/4 - 2 HP
• Stages: Single-Stage, In-Line Twin-Cylinder
• Drive: Reciprocating / Oil-Bath
• CFM Delivery: 3/4 HP = 2.7 CFM @ 100 PSI (Delivered) / 2 HP = 8 CFM @ 125 PSI (Delivered)
• Max PSI: 150 PSI
• Material of Construction: cast-iron with steel sleeves
• Flywheel: 10.375" OD single "A" groove
• RPM: 560 / 1,140
• Weight: 50 lbs.
• Bore & Stroke: 2.5" x 2"
• Bolt Pattern: 5.75" front-to-back, 5.875" side-to-side
• Dimensions (LWH): 10" x 11.125" x 14.25"
• Duty Cycle: 80/20
• Outlet: 3/8" FPT
• Warranty: 1 year limited

If you are replacing an older pump with serial number not beginning with G, then you will need a new belt guard and belt. This pump is 1" taller to hold more oil.

New flywheel size is 10.375" in diameter. If you have the larger 13.25" flywheel, determine the new pulley size for the motor by measuring the outside diameter (OD) of the existing pulley and multiply this number x .75 to come up with the correct new size.

Example:

4.25
x.75
3.1875" pulley (this can be rounded to the nearest pulley size, 3.25" or 3", for instance).

To find out which size belt you will need, simply go to this page and enter the appropriate dimensions: Belt Length Calculator

• Serving Customers Since 1994: For more than 30 years, Master Tool Repair has been a trusted source for air compressor parts, repair kits, and expert guidance.
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