Quick Info

This Ariel JGK-4 Reciprocating Compressor Package is driven by a Waukesha L7042GSI Natural Gas Engine capable of 1,376HP at 1200 RPM. The engine has 7,040 cu/in of displacement with a 9.375 Bore x 8.5” Stroke. The Ariel compressor unit is a JGK/4 with 2x of a 15-3/8” Bore x 5-1/2” stroke suction stages and 1x of a 10.5” Bore x 5-1/2” stroke discharge stage combined with 1x of a 6-1/4” Bore x 5-1/2” stroke discharge stage. The building has a 2 ton overhead crane to assist with maintenance. Ariel cooler included but not pictured. This package was taken out of service in GOOD RUNNING ORDER.

This package can be viewed in our Lloydminster Alberta storage yard. Please contact DAN at 403-613-7134 or call us toll free at 403-613-7134 for further information. You can also use our contacts page if you have any questions, need a quote or are ready to place an order.


Compressor Make:
Compressor Model
Year Built
Service Type
Operational Status Running
Driver Make
Driver Model L7042GSI
Compression Ratio 8:1
Bore & Stroke:
9.375” x 8.5” (238 x 216 mm)

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Ariel JGK-4 Reciprocating Compressor General Overview

Designed for continuous duty in the gas and oil industry, these medium-speed reciprocating separable compressors feature a wide range of cylinders, making them the industry choice for standard and specialized applications.

Features and Benefits

Full Pressure Lubrication: A frame-driven lube oil pump provides cooled oil through a full-flow oil filter to all moving parts in the frame. A divider-block system supplies metered oil to cylinder bores and rod packings.

High-Strength Bolting: Durable Grade 8 bolting on all loaded joints combined with specially designed fatigue-fighting bolts on all valve caps ensure ultimate holding strength.

Rigid Connecting Rods: The JGE/JGK/JGT compressors feature durable connecting rods manufactured from forged steel with 4 bolts and a heavy-duty “I” section.

Rugged Crossheads: One-piece, long-life crossheads with hardened, ground steel crosshead pins and direct, full-pressure lubrication at the top and bottom for minimum wear.

Innovative Cylinders: Ariel’s single and double-acting non-cooled cylinders eliminate the cost and maintenance associated with water cooling.

Durable Pistons and Rods: JGE/JGK/JGT compressors feature wear-resistant ductile or gray iron pistons and precision-ground alloy steel piston rods with locking crosshead nuts. Rolled threads are 1/4” under rod diameter for easy installation.

Precision Bearing Shells: Every Ariel compressor features precision-machined tri-metal main and connecting rod bearings.

Versatile Unloading Devices: Ariel offers manual, head-end variable volume clearance pockets on most cylinders. Pneumatic suction valve un-loaders are available on a limited basis.

Efficient Valving: Plate-type valves are designed for modern speeds, utilizing non-metallic sealing elements as standard. Valves are selected to comply with established low-valve velocity standards.

Heavy-Duty Crankshafts: JGE/JGK/JGT compressors feature forged steel, precision-machined crankshafts with integral counter-weights manufactured by Ariel Corporation.

High-Efficiency Spin-on Oil Filters: Ariel JGE/JGK/JGT compressors feature high-efficiency non-bypassing spin-on oil filters rated at 5 micron nominal and 17 micron absolute.

Rugged Crankcases: Ariel crankcases are designed for long service life and ease of access during maintenance. Our crankcases feature a heavily-ribbed, high-strength cast iron base with a removable lightweight aluminum top cover.

Waukesha L7042GSI VHP Natural Gas Engine Overview

VHP engines have been powering the world’s energy infrastructure―driving compressors in gas gathering, processing and transmission operations and providing electrical power for oil and gas fields in remote corners of the globe for over five decades.

Backed by more than a century of engine building experience, GE’s Waukesha engines are a sound investment that offer durable designs that perform reliably in remote applications and tolerance for variable fuel quality that maximizes power output, uptime and profitability.

Ariel JGK-4 Reciprocating Compressor Specifications

Year Built
Number of Throws
5.50 in
Rated RPM 635 BHP
40,000 lbf
Tension 37,000 lbf
74,000 lbf
Rod Diameter 2.000 in
Crankshaft Centerline
13.750 in
Main Diameter 5.625 in
Guide Design
Crankshaft Forged Steel
Connecting Rod
Forged Steel
Crosshead Ductile Iron
Crosshead Bushing

Waukesha F2895GSI Natural Gas Engine Specifications

Model L7042GSI S4
Horse Power 987 – 1480
Fuel Type
Natural Gas
Displacement 7040 cu in
Compression Ratio
Bore & Stroke 9.375 in x 8.5 in
Lube Oil Capacity
190 gal

Need more information?

Please call 403-613-7134, use our contact page or talk to one of our sales experts listed below if you have any questions, need a quote or are ready to place an order.

Dan Echino
Cell: 403-613-7134
E-mail: dan@calroc.ca

Larry Holman
Cell: 403-852-0966
E-mail: larry@calroc.ca

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