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3TH Series Heavy Duty Hydraulic Cylinders

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1. Piston Rods—5/8" thru 4" diameter are medium carbon steel with 100,000 psi minimum yield. Piston rods over 4" diameter have yield strengths between 50,000 and 90,000 psi. Sizes 5/8" thru 31/2" diameter are induction case hardened to 54 Rockwell C. All piston rods are hard-chrome plated and highly polished.

2. Rod Wiper—Polyurethane, double lip type wiper designed to protect the piston rod, bearing and rod seal, is standard for all rod sizes. Also, metallic scrapers and Viton wipers are available for all rod sizes.

3. Bolted Rod Gland Cartridges—Heavy wall, ductile iron bearing is accurately piloted in head to assure perfect alignment, designed to accept a variety of seal styles.With certain exceptions, the cartridges can be removed without removing mounts or tie rod nuts.This eliminates the necessity of cylinder disassembly to replace the rod seals or rod bearing. Bearings are held in place with bolted steel retainer plates. Bearing used for a given rod size are interchangeable into any cylinder bore with the same rod diameter.

a. Rod Seal—Polyurethane compound, flexible lip type rod seal has excellent abrasion resistance and is wear compensating. Inherent characteristics of the material and design assure leakproof performance and long life.

b. Rod Bearing—Ductile iron material insures low friction, high load capabilities and long life.

4. Ports—Large unrestricted ports permit maximum flow with minimum pressure drop.Heads may be rotated independently at 90° intervals for convenient port location. SAE straight thread ports are optional.Oversize ports, one size larger than standard, can be furnished on most bore sizes by welding a half-coupling to the standard head or cap.

5.Air Bleeds—Ball and setscrews are provided in the barrel when specified.The barrel can be rotated to place bleeders at top regardless of mounting position.

6. Head End Cushion—Floating type head end cushions are retained by shoulder on the rod.

7. Cylinder Barrel—The barrel is constructed of carefully selected, heavy wall steel tubing.The tubing is microhoned to assure smooth operation with minimum friction.

8. Heads—Rolled-steel heads are accurately machined to assure perfect alignment of piston rod and cylinder bore.Heads pilot on bore of tube and confine O.D. to prevent breathing.This provides additional insurance against leakage.

9.Tie Rods and Nuts—Tie rods are made from 100,000 psi minimum yield, medium carbon steel.They are pre-stressed at assembly with hi-strength alloy hex nuts.

10. Needle valves and check valves— Flush type needle valves and check valves are supplied. Large drilled passages provide maximum control of cushioning effect and assure rapid full power starts at beginning of stroke. Needle valves begin to leak prior to disengagement to prevent valve blow out. Ball checks are permanently retained.

11.Tube Seal—O-ring with back up washer assures a positive seal between head and barrel.

12. Cap End Cushion Plunger— Accurately machined cap end is an integral part of the piston rod.

13. Polyurethane U-Cup Type Piston— This type piston with polyurethane seals is standard in 3TH series cylinders and will be furnished unless otherwise specified. The piston, one-piece high grade alloy iron is pilot fitted to the piston rod and locked. Polyurethane flexible lip type piston seals have excellent abrasion resistance and wear compensating. Inherent characteristics of the material and design assure leak-proof performance and long life.

14. Ring Type Piston—This type piston, one piece high grade alloy iron is pilot fitted to the piston rod and locked. Ring type piston provides long life with trouble-free service. Application, however, must tolerate a moderate amount of by-pass.
NOTE: All types of pistons use the same rods and are interchangeable.

15.Wrench Flats—Large wrench flats are chamfered to protect rod gland packing in installation. Standard piston rods thru 51/2" diameter are furnished with two wrench flats, and additional flats are available upon request. Spanner holes are

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1941 W. County Road C-2 •  Roseville, MN 55113 •  Phone: 651-633-0550 • Fax: 651-633-6797  • Email: sales@mmrogness.com