Rolair JC10 / VT Portable Recip

JC10 Plus, VT25BIG, 6590HK18

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Rolair JC10 / VT Portable Recip

1–5.5 hp single-stage portable recips with cast-iron pumps. Belt-driven, air-cooled.

Type
Single-stage reciprocating
Power
1–5.5 hp
Flow
3–13 cfm @ 90 psig
Pressure
90–150 psig
Cooling
air
Drive
belt
Lubrication
oil-lubricated
Models
JC10 Plus, VT25BIG, 6590HK18
Years produced
Rolair (Milwaukee-headquartered) since 1959.
Sound level
JC10 ~60 dB(A) — one of the quietest jobsite portables.
Weight
JC10 ~60 lb; VT25BIG ~200 lb; 6590HK18 ~340 lb.
Ambient range
20–104 °F.
Warranty
1-year package / longer on pump.
Control modes
  • Pressure switch
Typical applications
  • Trim carpentry
  • Roofing
  • Small jobsites

Specs & intervals below are from publicly published OEM literature and long-standing field practice. Torque values, exact revision-dated part numbers, and safety-critical settings vary by serial number — always cross-check the unit’s OEM manual and nameplate before ordering parts or performing service.

Fluid
Spec: SAE 30 non-detergent or Rolair synthetic
Capacity: 10–16 oz typical
Change interval: 200 hr mineral / 500 hr synthetic
Torque guidance

Head bolts per pump nameplate torque chart. Belt: ½" deflection midspan.

Always verify torque values against the OEM service manual for the specific serial number.

Wear parts
CategoryIntervalSource
Inlet filter200–500 hr
V-beltAnnual inspect
Reed valveInspect 2,000 hr
Check valveInspect at PM

Consumable part numbers change by revision and region — pull the current number from the OEM portal.

Preventive maintenance
Daily
  • Check crankcase oil level
  • Drain tank moisture
  • Listen for valve tick / knock
  • Verify unloader operates on cut-out
Every 500 hr
  • Change crankcase oil (mineral) or verify PAO/synthetic at manufacturer interval
  • Clean or replace inlet filter
  • Check belt tension & sheave alignment
  • Torque head bolts to spec if any weeping
Annual / 2,000 hr
  • Pull head; inspect reed/disc valves and seats
  • Check ring gap and cylinder wear
  • Torque head bolts to OEM spec in cross pattern
  • Test safety valve
  • Inspect crankshaft & rod bearings on splash-lube units
Every 4–6,000 hr
  • Top-end rebuild (rings, valves, gaskets)
  • Inspect rod bearings and crank end play
  • Verify aftercooler condensate drain
Common faults & first checks
  • Slow buildup — valves
  • Belt slap on cold start
Known issues & field notes
  • JC10 quiet-package fan bearing needs periodic check
Strengths
  • Cast-iron pumps in a portable size
  • Well-liked by trim carpenters and roofers
  • Very quiet JC10
Weaknesses
  • Not industrial-duty for continuous run
Field notes

Rolair is a well-regarded jobsite portable recip brand.

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