QYL Series Hydraulic Jack

With a lifting capacity ranging from 2 to 1,000 tons (t), the hydraulic jack works in tandem with the QL series mechanical screw jack. The product is suitable for railway vehicle maintenance, mining operations, construction support, and general hoisting and lowering of heavy loads. Thanks to its portability, low-maintenance design, and safe and reliable operation, it is widely used in mobile lifting applications. Whether replacing wheel axles on railway cars, supporting steel beam installations, positioning heavy machinery during ship hull assembly, or lifting vehicles for tire changes, this jack delivers dependable lifting performance for a broad range of heavy-duty tasks.

Hydraulic Jack Specifications

• Product Name: Hydraulic jack
• Model and Specification: QYL series
• Category: Lifting tools
• Place of Origin: Henan / Shanghai
• Execution Standard: GB/T 27697-2011
• Customization: Available
• Power Type: Manual
• Stock Availability: Partial stock
• Production Lead Time: 10–20 days
• Packaging: Carton / Wooden case
• Supply Scope: Nationwide
• Delivery Method: Pickup or freight forwarding
• After-Sales Service: Free maintenance within 90 days
• Shipping Region: Changyuan, Xinxiang, Henan

Hydraulic Jack Operating Instructions

1. Structural Features: This is a vertical hydraulic lifting tool that operates on the hydraulic principle. It features a compact structure and is easy to carry.
2. Lifting and Lowering: To raise the load, tighten the release valve knob with the handle and pump the handle up and down. To lower, slightly loosen the release valve knob and the load will descend smoothly.
3. Pre-Operation Inspection: Before use, verify that the jack operates correctly. The jack must be placed on a stable, level surface and must never be used on its side or inverted.
4. Selecting the Lifting Point: Determine the center of gravity of the load and choose an appropriate lifting point. The load weight must not exceed the rated capacity — never overload the jack.
5. Hydraulic Oil Selection: Use N15 machinery oil (GB443-84) for temperatures between 5°C and +45°C. For temperatures between -5°C and -20°C, switch to synthetic spindle oil (GB442-64).
6. Adding Oil: To add oil, lay the jack horizontally so the fill plug on the outer sleeve faces upward, remove the plug, and add the specified hydraulic oil.
7. No Disassembly: Do not disassemble the jack during its service life. For repairs, please contact the manufacturer.

Safety Precautions

• Read and understand the entire Operation Manual before operating this equipment.
• Never exceed the rated lifting capacity.
• Use only on hard, load-bearing surfaces.
• For lifting only — never use as a support or stand.
• Never work under a load supported solely by a jack.
• Failure to follow these safety warnings may result in personal injury or property damage.

Hydraulic Jack Manufacturer

As a professional hydraulic jack manufacturer, we supply both domestic and imported brands of small, medium, and large split-type jacks, horizontal jacks, claw-type jacks, synchronized jacks, oil-pressure jacks, DTS electric hoists, and industry-specific jacks. We also provide production, manufacturing, maintenance, and repair services. For more information on jack models and specifications, technical parameters, product features, operation modes, structural types, materials, common faults and troubleshooting methods, as well as pricing for complete units and spare parts, please contact customer service for consultation.

Frequently Asked Questions (FAQ)

Q: What is the difference between a QYL hydraulic jack and a QL screw jack?

A: The QYL hydraulic jack operates on the hydraulic principle (hydraulic cylinder + piston + manual oil pump), using hydraulic oil to transmit power. It offers fast lifting speed and high efficiency. The QL screw jack uses a mechanical screw drive (screw spindle + bronze nut), which lifts more slowly but is leak-proof and requires minimal maintenance. The hydraulic jack's advantages are effortless operation and smooth lifting; its drawbacks are that seals are prone to aging and require periodic oil changes.

Q: What should I do if my QYL jack fails to lift or lowers too slowly?

A: Common causes and solutions: ① Low hydraulic oil — refill to the standard oil level; ② Release valve knob not tightened — tighten the release valve knob; ③ Clogged oil intake — clean the intake filter screen; ④ Worn seals — replace the O-Ring Seal; ⑤ Oil temperature too low — switch to low-temperature hydraulic oil. If none of these resolve the issue, please contact the manufacturer for inspection.

Q: What type of hydraulic oil should be used in QYL series jacks?

A: For standard temperature ranges (5°C to +45°C), use N15 machinery oil (GB443-84). For low-temperature environments (-5°C to -20°C), switch to synthetic spindle oil (GB442-64). Never mix different grades of hydraulic oil. To add oil, lay the jack horizontally and fill through the fill port on the outer sleeve.

Q: What do the D and DS suffixes on QYL jacks mean?

A: The D type is a low-profile hydraulic jack (with a lower minimum height), suitable for confined spaces. The DS type is an ultra-low-profile version (with an even lower minimum height but no height adjustment). Models without a suffix are standard type. For example, the QYL32 D has a minimum height of 255mm, the QYL32 DS has a minimum height of 225mm (no adjustment screw), and the QYL32 standard model has a minimum height of 285mm.

Q: How often should the hydraulic oil in a jack be changed?

A: We recommend changing the hydraulic oil every 12 months. To change the oil, lay the jack flat, remove the oil plug, drain the old oil, and refill with new oil of the same grade to the standard oil level. For high-frequency use (daily) or harsh operating conditions (high dust/humidity), we recommend changing the oil every 6 months. Be sure to bleed the system after refilling: pump the handle several times with no load to expel trapped air.