YD21-007 to YD21-010 Economic Toe Jack Webpage Detail Page (English)

I. Product Specifications (SPECIFICATION)

1. Series Basic Information & Core Common Configurations

2. Key Parameter Comparison of Each Model

II. Product Details (PRODUCT DETAILS)

1. Dual Load-Bearing Modes + Wide Height Range, No Dead Ends in Full-Scenario Operations

(1) Toe Lifting as Low as 17mm, Overcoming "Stuck" Problems

(2) Head Support as High as 510mm, Meeting In-Depth Operation Needs

2. High-Strength Structure + Full Temperature Range Adaptation, More Reliable in Extreme Scenarios

(1) Special Steel Ram + Welded Base, No Pressure Under Heavy Load

• Ram Performance: After 100,000 fatigue tests (simulating repeated lifting under rated load), the permanent deformation of the heat-treated special steel ram is ≤0.1mm, and the 15T model (YD21-010) shows no bending when lifting a 20T heavy object;
• Welding Process: The electric welding joints of the base and cylinder undergo flaw detection, with no false welding or missing welding. When the 10T model (YD21-009) supports 14T bridge components, there is no risk of weld cracking, and the service life is 3 times longer than that of ordinary cast iron bases.

(2) Unafraid of Extreme Temperatures, All-Weather Operation

3. Lightweight Design + Safety Protection, Dual Optimization of Operation and Guarantee

(1) Lightweight Starting from 8.5kg, Operable by One Person

(2) Dual Safety Protection, Eliminating Risks

• Overload Safety Valve: Strictly compliant with ANSI/ASME PALD 2009 standards, it instantly cuts off the oil circuit when overloaded. For example, when the YD21-008 (5T toe load) lifts a 6T heavy object, the valve starts immediately to avoid ram bending;
• Anti-Slip Base: The bottom of the base has diamond-shaped anti-slip patterns, with a friction coefficient ≥0.8 on cement ground and ≥0.6 on wet ground (shipyards), ensuring no displacement during support. The safety factor is 60% higher than that of jacks with smooth bases.

III. Application Scenarios (APPLICATION SCENARIOS)

1. Small House Translation by House Moving Companies (YD21-007)

1. One person carries the YD21-007 (8.5kg) to the four corners of the house, and the 17mm toe height easily extends into the gap between the foundation and the ground.
2. Press the pump handle to lift the house to a height of 132mm (maximum toe height) with the toe, and insert temporary support blocks.
3. After moving the house to the target position, replace the support blocks with the head (minimum height 235mm), slowly release pressure to lower the house to the specified height; the whole process takes 4 hours.
   Result: The low-clearance adaptation eliminates the need for foundation damage, and the lightweight design saves labor. Compared with traditional tools (requiring foundation modification), the efficiency is increased by 40%, suitable for small house translation scenarios.

2. Medium-Sized Machine Tool Installation and Positioning in Machinery Factories (YD21-008)

1. Two people push the YD21-008 to the bottom of the machine tool, the 27mm toe height extends into the base gap, and the 75×57mm toe fits the machine tool support point.
2. Press the pump handle to lift the machine tool to a height of 147mm with the toe, adjust the position with mechanical skates, and switch to head support to a maximum height of 413mm after positioning.
3. Fix the machine tool anchor bolts; the whole process takes 2.5 hours without unstable support, and the wide-temperature hydraulic oil adapts to the 35℃ high temperature in the workshop.
   Result: The dual load-bearing mode adapts to the entire process of "lifting-positioning-support". Compared with traditional tools (requiring multiple equipment replacements), the efficiency is increased by 50%, ensuring precise machine tool installation.

3. Small Bridge Component Splicing at Bridge Construction Sites (YD21-009)

1. Two people carry the YD21-009 to the bottom of the component, the 31mm toe height extends into the splicing gap, and the 84×60mm toe tightly supports the component.
2. Press the pump handle to lift the component to a height of 176mm, switch to head support to a maximum height of 472mm after adjusting the docking position, leaving space for welding.
3. Workers complete the weld splicing; the whole process takes 3 hours with no ram rust, and the anti-slip base copes with the muddy ground at the construction site.
   Result: The high-load and rust-resistant design adapts to bridge construction site scenarios. Compared with ordinary jacks (prone to rust and insufficient load capacity), the splicing accuracy is increased by 30%, ensuring construction safety.

4. Hull Section Support in Shipyards (YD21-010)

1. Two people cooperate to push the YD21-010 to the bottom of the hull, the 31mm toe height extends into the bottom gap, and the 100×70mm toe bears force evenly.
2. Press the pump handle to lift the hull to the maximum toe height of 196mm, switch to head support to the maximum height of 510mm to meet the operation needs inside the hull.
3. Workers install pipelines inside the hull; the whole process takes 5 hours with no hydraulic system leakage, and the rust-resistant ram resists welding dust in the workshop.
   Result: The 20T head load capacity and high stroke adapt to hull support. Compared with traditional tools (requiring multiple stacking), the number of equipment is reduced, and the utilization rate of the operation space is improved.

IV. Frequently Asked Questions (FAQ)

Q1: Can the YD21-008 (5T toe load) lift an 8-ton machine tool? Will the overload protection be triggered?

Q2: During use, the toe/head cannot lift or lower smoothly and has a stuck feeling. What is the reason and how to solve it?

1. Check the hydraulic oil level: Open the oil filling port; if the oil level is below the scale line (needing to cover 1/2 of the cylinder bottom), add 46# anti-wear hydraulic oil (for northern winter, -30℃ wide-temperature type is recommended) to the standard position, and press the pump handle repeatedly 5 times to discharge air;
2. Clean the oil circuit: If the oil level is normal, disassemble the pressure relief valve, blow out oil circuit impurities with compressed air (0.3MPa), or rinse with alcohol and reassemble to avoid valve core jamming by impurities;
3. Treat ram rust: If there is rust on the ram, polish it with 400-grit sandpaper, apply anti-rust oil, and lift/lower the ram repeatedly 10 times to ensure smooth operation. Later, anti-rust oil should be applied regularly (every 2 months) for maintenance.

Q3: The YD21-010 weighs 48.5kg. Can two people carry it to the bottom of the hull? Are there any labor-saving tips?

1. Use a flat cart: Place the YD21-010 on a flat cart with a load capacity ≥100kg. Two people push both sides of the cart respectively, moving labor-savingly with the help of wheel rolling, saving 60% of physical strength compared to direct carrying;
2. Correct carrying posture: For short-distance lifting, two people stand on both sides of the equipment respectively, hold the metal handles on both sides of the base (load-bearing design area) with both hands, bend their knees and straighten their waists to exert force with their legs, avoiding bending over to exert force with the waist to reduce the risk of lumbar muscle strain;
3. Use hoisting assistance: If there is a small crane in the workshop, the equipment can be lifted through the hoisting hole on the top (a lifting ring needs to be prepared by yourself) and carried vertically to the bottom of the hull, suitable for high-difficulty operation positions.

Q4: After long-term outdoor use, fine cracks appear at the base welds. Will this affect safety? How to handle it?

• Safety Risks: Fine cracks will gradually expand under load, which may cause base fracture and load falling, especially for models above 10T, the risk is higher;
• Repair Method: Contact the manufacturer's after-sales service or professional welders to repair the cracks by arc welding (the electrode should match the base steel model). After welding, conduct flaw detection to confirm no internal defects, then apply anti-rust paint for protection;
• Preventive Measures: After outdoor use, wipe off oil and water stains on the base with a dry cloth, check the welds every month, and promptly handle rust or cracks