Castair Replacement Pump Motor Kit G30R (15-30HP) - MKG30R

$1,253.86 USD
$1,253.86 USD
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The Castair MKG30R covers the G30 air end on 15–30HP rotary screw compressors. Based on Castair''s official parts reference, MKG30R is listed in the preventative maintenance kit lineup as the PM kit for the G30 air end — same kit structure as the MKD62 and MKG11: two air filters, four oil filters, one separator filter, and five gallons of CAST-LUBE synthetic oil. Some product listings reference this part as a "Replacement Pump Motor Kit," which may indicate MKG30R also covers or includes air end component replacement depending on the configuration — if your application requires a pump/motor assembly rather than consumable filters, call 866-217-0063 to confirm exactly what is included in your order. The information here reflects Castair''s official parts table, which classifies MKG30R as the G30 PM kit.

G30 Air End — What This Kit Covers

  • Air end designation: G30, used in Castair rotary screw compressors from 15HP through 30HP
  • Compatible units (confirmed models): R15312VG30 (15HP, 3-phase, 120-gallon vertical, 58 CFM), R15312HG30 (horizontal), R20312VG30 (20HP, vertical), R20312HG30 (horizontal), R25312VG30 (25HP, vertical), R25312HG30 (horizontal), R30312VG30 (30HP, vertical), R30312HG30 (horizontal)
  • HP range: 15HP, 20HP, 25HP, and 30HP Castair rotary screw units with G30 air end
  • Note on naming: If your documentation or SKU list shows this as a pump/motor kit and you need confirmation of contents, call before ordering. The castair.net parts table is clear: MKG30R is the G30 PM kit in the maintenance kit lineup.

Why Buy a Kit Instead of Individual Filters

  • 10% savings vs. individual parts: All four Castair PM kits carry a 10% discount versus buying the same filters and oil separately. On a larger 25–30HP unit with higher-volume filters, that discount represents meaningful savings per service cycle.
  • Largest filters in the PM kit lineup: The G30 air filter (32DP, OD: 9 1/4") is the biggest air filter in the Castair kit range. This is a larger-format filter than the D62 (OD: 6 1/8") or G11 (OD: 3 7/8"). Ordering the kit ensures you get the correct size — the 32DP is easy to confuse if you are cross-referencing dimensions without the part number.
  • Complete service interval in one shipment: Two air filters, four oil filters, one separator, and five gallons of synthetic oil. When your G30 hits service hours, pull this kit and get it done without partial-service situations.
  • OEM-matched components: Every part in the kit is Castair-spec for the G30 air end. No dimension guessing, no aftermarket substitutes.

Kit Components

  • Air Filters (qty 2): Part number 32DP. Paper element. ID: 5 3/4", OD: 9 1/4", Height: 5 3/16". The largest air filter in the Castair PM kit lineup — sized for the higher airflow requirements of 15–30HP rotary screw units with the G30 air end.
  • Oil Filters (qty 4): Part number ROFD16-G30. Spin-on design. Shared with the D16 air end. If your shop runs Castair D16 units alongside G30 units, these filters cover both platforms.
  • Separator Filter (qty 1): Part number RSFD10-16-G30. Spin-on design. Multi-platform separator — also fits D10 and D16 air ends. The separator is the most critical filter in the system; it removes entrained oil from compressed air before it reaches downstream equipment. Using an OEM separator rated for your air end is not a place to substitute.
  • CAST-LUBE Synthetic Compressor Oil (5 gallons): Castair''s own synthetic formulation for rotary screw air ends. Designed for the operating temperatures and pressures of rotary screw equipment. Five gallons covers one full oil change for a unit in this HP range.

Compatible Castair Unit Models

  • R15312VG30: 15HP, 3-phase, 120-gallon vertical tank, 58 CFM, G30 air end
  • R15312HG30: 15HP, 3-phase, horizontal tank, G30 air end
  • R20312VG30: 20HP, 3-phase, vertical tank, G30 air end
  • R20312HG30: 20HP, 3-phase, horizontal tank, G30 air end
  • R25312VG30: 25HP, 3-phase, vertical tank, G30 air end
  • R25312HG30: 25HP, 3-phase, horizontal tank, G30 air end
  • R30312VG30: 30HP, 3-phase, vertical tank, G30 air end
  • R30312HG30: 30HP, 3-phase, horizontal tank, G30 air end

What's in the Kit

  • 2x Air Filter 32DP (G30 paper element, ID: 5 3/4", OD: 9 1/4", HGT: 5 3/16")
  • 4x Oil Filter ROFD16-G30 (spin-on, also fits D16)
  • 1x Separator Filter RSFD10-16-G30 (spin-on, also fits D10/D16)
  • 5 gallons CAST-LUBE synthetic compressor oil

Available Castair Preventative Maintenance Kits

  • MKP75 — P75 Air End, 5–15HP: Two air filters (20DP), four oil filters (ROFD62-P75), one separator (RSFLD3-4-6-G11-P75), five gallons CAST-LUBE. Smallest kit in the lineup, for P75 platform units.
  • MKG11 — G11/C11 Air End, 5–15HP: $628.47. Two air filters (RAFG11, OD: 3 7/8"), four oil filters (ROFD3-4-G11), one separator (RSFLD3-4-6-G11-P75), five gallons CAST-LUBE. For G11/C11 platform units.
  • MKD62 — D62 Air End, 15–25HP: $704.70. Two air filters (RAFD6-62, OD: 6 1/8"), four oil filters (ROFD62-P75), one separator (RSFD62), five gallons CAST-LUBE. Mid-range kit for D62 units.
  • MKG30R — G30 Air End, 15–30HP (this kit): Largest PM kit in the lineup. Air filter 32DP (OD: 9 1/4") handles the highest-airflow units in the Castair rotary screw range. For 15–30HP G30 platform units.

All four kits save 10% vs. individual parts. Call 866-217-0063 to confirm which kit matches your specific model number.

Filter Reference — G30 Air End Individual Parts

  • Air Filter: 32DP — ID: 5 3/4", OD: 9 1/4", HGT: 5 3/16" — G30 paper element
  • Oil Filter: ROFD16-G30 — spin-on, also fits D16
  • Separator Filter: RSFD10-16-G30 — spin-on, also fits D10/D16
  • Oil: CAST-LUBE synthetic, available in 5-gallon jugs

When Does a Shop Need This Kit

  • You have a 15–30HP Castair rotary screw unit with a G30 air end approaching its service interval. The MKG30R is the correct PM kit. The 32DP air filter is large format — do not try to substitute a smaller filter from the D62 or G11 kit.
  • You run one of the R-series G30 models (R15312VG30, R20312VG30, R25312VG30, R30312VG30, or horizontal equivalents). These are confirmed G30 air end units. The MKG30R is your service kit.
  • You run a 30HP unit at high duty cycle: A 30HP rotary screw running continuous or near-continuous duty needs on-schedule PM more urgently than a lightly-used machine. Stocking the MKG30R before the service interval hits prevents unplanned downtime.
  • You need the separator for a D10 or D16 unit: The separator (RSFD10-16-G30) and oil filter (ROFD16-G30) in this kit also fit D10 and D16 air ends. If you run a D16 alongside a G30, this kit covers filters for both.
  • Step down to MKD62 instead if your unit is a 15–25HP machine with a D62 air end. The D62 uses a smaller air filter (RAFD6-62, OD: 6 1/8") — you cannot use the 32DP G30 filter on a D62.
  • Step down to MKG11 or MKP75 instead for units under 15HP. The G11 and P75 air ends use significantly smaller filters — the G30 kit parts will not fit.
  • If you need a pump or motor assembly: Some listings reference MKG30R as a pump/motor replacement. If you need a complete air end or pump/motor assembly rather than consumable PM filters, call 866-217-0063 to confirm what is in the kit and whether a pump/motor assembly is available for your unit.

Technical Specifications

  • Kit Part Number: MKG30R
  • Air End: G30
  • HP Range: 15–30HP rotary screw compressors
  • Air Filter P/N: 32DP
  • Air Filter ID: 5 3/4"
  • Air Filter OD: 9 1/4"
  • Air Filter Height: 5 3/16"
  • Air Filter Type: Paper element
  • Air Filter Qty in Kit: 2
  • Oil Filter P/N: ROFD16-G30
  • Oil Filter Type: Spin-on
  • Oil Filter Also Fits: D16 air end
  • Oil Filter Qty in Kit: 4
  • Separator Filter P/N: RSFD10-16-G30
  • Separator Filter Type: Spin-on
  • Separator Also Fits: D10, D16 air ends
  • Separator Filter Qty in Kit: 1
  • Oil Type: CAST-LUBE synthetic compressor oil
  • Oil Qty in Kit: 5 gallons
  • Savings vs. Individual Parts: 10%
  • Manufacturer: Castair (Cast Air)
  • Compatible Models: R15312VG30, R15312HG30, R20312VG30, R20312HG30, R25312VG30, R25312HG30, R30312VG30, R30312HG30

Why Buy From Air Compressor Factory Direct?

  • Compressor parts specialists: We know the full Castair PM kit lineup and which kit matches which air end. The G30 filter dimensions are large enough that getting the wrong kit would be immediately obvious — but we confirm compatibility before you order anyway.
  • Free shipping: The MKG30R ships free. A 32DP filter (OD: 9 1/4") plus four oil filters and five gallons of oil is a substantial shipment — free shipping is real savings here.
  • Free tech support: Call 866-217-0063 before ordering if you have any question about whether your unit runs a G30 or a different air end, or if you need clarification on whether MKG30R is a PM kit or a pump/motor assembly for your application.
  • Full manufacturer warranty: All Castair OEM parts carry the full Castair warranty. No gray-market parts, no aftermarket substitutes.
  • Honest recommendations: If you describe your unit and the MKG30R is not the right fit, we will tell you which kit is. We do not sell parts that do not fit your machine.

Call 866-217-0063 for quick answers and help!