FS-Curtis RS Series Rotary Screw

Name: FS-Curtis RS Series Rotary Screw
Brand: FS-Curtis

5–100 hp oil-flooded rotary screw. Belt- or direct-drive, air-cooled.

Type

Oil-flooded rotary screw

Power

5–100 hp

Flow

17–475 cfm

Pressure

100–175 psig

Cooling

air

Drive

belt-or-direct

Lubrication

oil-flooded

Models

RS5, RS10, RS20, RS30, RS50, RS75, RS100

Years produced

RS ~2008 – present.

Sound level

~66–74 dB(A) @ 1 m enclosed.

Ambient range

40–115 °F.

Motor efficiency

IE3 / NEMA Premium.

Warranty

2-year package / 5-year airend option.

Control modes

Load/Unload

Typical applications

General shop air
Light industrial

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: FS-Curtis RS Fluid (PAO)

Change interval: 4,000–8,000 hr per fluid grade

Wear parts

Category	Interval	Source
Air filter	2,000 hr
Oil filter	2,000 hr
Separator element	4,000 hr
Motor bearings	Per motor plate

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

Parts cross-reference

OEM part numbers with commonly-cited aftermarket equivalents. Verify against the nameplate and OEM parts portal before ordering — dimensionally similar filters can still be wrong for the application.

Air filter

OEM

MCA00040

Aftermarket

P822858— Donaldson
SA 16430— Hifi

VerifiedConfirmed against a public OEM or aftermarket catalog / cross-reference tool at time of entry.LikelyCommonly cited in the vendor's cross tool or long-standing field usage; not independently re-verified against the current OEM parts list.UnverifiedDimensional lookalike or user-reported.

P822858— DonaldsonLikely
source
SA 16430— HifiLikely
source

Oil / fluid filter

Fluid filter

OEM

FDS20204

Aftermarket

P550425— Donaldson
B7577— Baldwin

P550425— DonaldsonLikely
source
B7577— BaldwinLikely
source

Air-oil separator

Separator

OEM

FDS20203

Aftermarket

P532473— Donaldson
OS 5223— Hifi

P532473— DonaldsonLikely
source
OS 5223— HifiLikely
source

Lubricant

Curtis Xtreme Duty

OEM

MHF00013 (5 gal)

Aftermarket

Supra 46— Summit

Supra 46— SummitUnverified

Need to look up a number across all models? Use the parts cross-reference search.

Preventive maintenance

Daily

Check fluid level in sight glass at running temp
Listen for unusual noise / vibration
Check discharge pressure & temperature vs baseline
Verify condensate drain function
Log package amps if metered

Weekly

Blow down receiver and drain traps
Check for oil carryover at first drop leg
Inspect for fluid or air leaks around airend and separator tank
Verify safety valve is not weeping

Every 2,000 hr / 6 mo

Change fluid filter
Change air filter (or sooner per ΔP)
Sample fluid for TAN / metals / water
Clean cooler exterior with low-pressure air (never > 30 psi against fins)

Every 4,000 hr / 12 mo

Change separator element
Change fluid
Inspect scavenge line & orifice for coking
Check coupling / belt alignment & wear
Torque electrical lugs to spec (typ. 45–75 in-lb #4–2/0 AWG)

Every 8,000 hr

Rebuild inlet valve
Rebuild minimum-pressure check valve
Regrease or replace motor bearings per OEM interval
Verify safety valve setpoint against gauge

Common faults & first checks

High temp on cooler pluggage
Sep ΔP

Strengths

Value-priced industrial screw
Simple controls

Weaknesses

Fewer smart features than Sigma / Elektronikon / Xe

Field notes

RS covers small to mid industrial screws in the FS-Curtis lineup.