ELGi EG / EN Series Rotary Screw

Name: ELGi EG / EN Series Rotary Screw
Brand: ELGi

5–350 hp oil-flooded rotary screw platform. Belt- or direct-drive depending on frame.

Type

Oil-flooded rotary screw

Power

5–350 hp

Flow

17–1,700 cfm

Pressure

100–190 psig

Cooling

air-or-water

Drive

belt-or-direct

Lubrication

oil-flooded

Models

EG 11–250, EN 04–37

Years produced

EG series ~2010 – present; ELGi (India) founded 1960; aggressive NA expansion since 2012.

Sound level

~66–76 dB(A) @ 1 m enclosed.

Ambient range

40–115 °F standard; high-ambient package to 130 °F.

Motor efficiency

IE3 / NEMA Premium standard; IE4 on newer builds.

Warranty

'Always Better' 10-year airend warranty program on select frames.

Control modes

Load/Unload
Modulation
VSD variants (Eta-V)

Typical applications

General plant air
Cost-sensitive 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: ELGi Eloxy or approved PAO

Change interval: 4,000–8,000 hr

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

Intake filter

OEM

B040100060072

Aftermarket

P828889— Donaldson
C 24 650/1— Mann-Filter

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.

P828889— DonaldsonLikely
source
C 24 650/1— Mann-FilterLikely
source

Oil / fluid filter

Oil filter

OEM

B040100060105

Aftermarket

P550425— Donaldson
LF3325— Fleetguard

P550425— DonaldsonLikely
source
LF3325— FleetguardLikely
source

Air-oil separator

Separator

OEM

B040100060082

Aftermarket

P532473— Donaldson
OS 5223— Hifi

P532473— DonaldsonLikely
source
OS 5223— HifiLikely
source

Lubricant

ELGi e-Ni (PAO 8000 hr)

OEM

ELGi e-Ni 5 gal

Aftermarket

Rarus SHC 1025— Mobil

Rarus SHC 1025— MobilUnverified

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

Aggressive value pricing
AB airend (η-V) design is well-regarded
10-year airend warranty program

Weaknesses

Newer to NA market — dealer coverage growing

Field notes

ELGi (India) has expanded aggressively in NA — good option where budget matters.