The YD21-011 to YD21-013 Industrial Toe Jack Series is a professional equipment developed to address the pain points of "unstable lifting, difficult positioning, and uncontrollable descent in industrial heavy-load scenarios". With "heavy-load stability + flexible positioning + safe controllability" as the core, it breaks through the limitations of traditional industrial jacks such as "easy ram bending, limited positioning, and high descent risks", providing a lifting solution that "lifts stably, rotates flexibly, and descends slowly" for industrial heavy-load operations. Its core advantages are as follows:
Traditional forward rams tend to bend due to uneven force when lifting heavy loads. However, the reversed ram design of this series transfers the force point to the reinforced part of the frame. Combined with a 12mm thick cold-rolled steel main body (tensile strength ≥950MPa), the ram deflection of the 5T model (YD21-011) is ≤0.05mm when lifting 5T railway equipment; even the 25T model (YD21-013) bears a peak load of 25T, the frame shows no permanent deformation. Its service life is 2.5 times longer than that of traditional forward-ram jacks, adapting to high-frequency heavy-load needs in industrial scenarios.
The housing can rotate freely 360°, allowing adjustment of the lifting direction without moving the entire equipment. For example, when maintaining railway turnouts, traditional jacks require repeated handling and angle adjustment (taking 15 minutes per positioning), while the YD21-012 only needs to rotate the housing to align with the turnout support point, completing positioning in 3 minutes—efficiency increased by 80%. Moreover, there is no relative sliding between the ram and the load during rotation, avoiding equipment scratches caused by positioning adjustments and ensuring the safety of industrial precision equipment.
The built-in hydraulic throttle device can precisely control the ram descent speed by adjusting the pressure relief valve: when lifting a 5T machine tool, the minimum descent speed can reach 5mm/s, 75% lower than that of traditional uncontrolled jacks (descent speed over 20mm/s), avoiding base collision caused by sudden machine tool dropping; when the 25T model (YD21-013) lifts heavy components, the descent speed can be fine-tuned to achieve precise alignment between the component and the installation position, with an installation error controlled within ±2mm—90% more precise than traditional tools.
- Overload Safety Valve: Strictly following ANSI/ASME PALD 2009 standards, it instantly cuts off the oil circuit when exceeding 10% of the rated load. For example, when the YD21-011 (5T load capacity) lifts a 5.5T heavy object, the valve activates immediately to prevent ram bending or cylinder bursting;
- High-Strength Pump Lever: The removable pump lever is made of alloy material (hardness ≥HRC40) with a maximum operating force of 38-40kg, which can be easily pressed by adult males. The connection between the pump lever and the pump body is designed with anti-falling features, avoiding safety accidents caused by accidental pump lever detachment during operation.
- Low-Clearance Adaptation: The minimum toe lifting height is 25mm (YD21-011), which can extend into the bottom of railway tracks (clearance usually 20-30mm) and heavy machine tool bases (clearance 25-35mm) without adding lining steel plates. Compared with traditional jacks (minimum height over 50mm), the low-clearance adaptation rate is increased by 100%;
- High-Height Support: The maximum head lifting height is 720mm (YD21-013), providing over 50cm of operating space after lifting, meeting in-depth operation needs such as heavy component welding and machine tool anchor bolt fixing. No repeated heightening is required, adapting to the entire "lifting-operation-descending" process in industrial scenarios.
The 5T model (YD21-011) has a net weight of only 25kg, which can be carried to the work station by one person with both hands; the 10T model (YD21-012) has a net weight of 35kg, which can be easily moved by two people in collaboration; even the 25T heavy model (YD21-013) with a net weight of 102kg can be conveniently dispatched with a workshop forklift. Compared with traditional industrial jacks of the same specification (mostly over 150kg), it is 32% lighter, reducing equipment handling costs and labor input in industrial scenarios.
Scenario Requirement: Maintain 5T railway track components (track bottom clearance 23mm), requiring low-clearance lifting and precise positioning, and stable safety for outdoor operations.
Operation Process:
- One person carries the YD21-011 (25kg) to the bottom of the track; the 25mm toe height easily extends into the track gap and aligns with the support point.
- Insert the removable pump lever, press with a 38kg operating force to lift the track to the maximum toe height of 230mm, and rotate the 360° housing to adjust the track angle for component maintenance.
- After maintenance, slowly lower the track to its original position through the controlled descent device, disassemble the pump lever for storage; the whole process takes 1.5 hours with no equipment shaking.
Result: Low-clearance adaptation eliminates the need for track foundation damage, and 360° rotation simplifies positioning. Compared with traditional tools (requiring track disassembly), the efficiency is increased by 60%, suitable for outdoor railway maintenance scenarios.
Scenario Requirement: Install a 12T CNC lathe (base clearance 28mm), requiring a load capacity of over 10T and high-height support, and controlled descent for precision workshop operations.
Operation Process:
- Two people push the YD21-012 to the bottom of the machine tool; the 30mm toe height extends into the base gap, and press the pump lever with a 40kg operating force to lift the machine tool to a height of 260mm.
- Adjust the machine tool position with mechanical skates, rotate the housing to align with the installation reference line, and switch to head support to the maximum height of 650mm to leave space for bolt fixing.
- After fixing the anchor bolts, lower the machine tool at a speed of 8mm/s through the controlled descent device to ensure precise alignment with the installation position; the whole process takes 3 hours with no collision.
Result: Heavy-load bearing and controlled descent ensure installation precision. Compared with traditional jacks (prone to sudden descent), the installation error is reduced to ±2mm, meeting the precision operation standards of machinery factories.
Scenario Requirement: Relocate a 20T industrial motor (base clearance 55mm), requiring a load capacity of 25T and high-clearance operation, and flexible positioning in narrow workshop spaces.
Operation Process:
- Transport the YD21-013 to the bottom of the motor with a forklift; the 58mm toe height extends into the base gap, and the 100×80mm toe fits the motor support point.
- Press the pump lever to lift the motor to the toe height of 273mm, rotate the 360° housing to adjust the motor direction, and move the motor to the target work station with a crane.
- Switch to head support to the maximum height of 720mm, slowly release pressure to place the motor on the installation platform; the whole process takes 4 hours with no unstable support.
Result: Ultra-heavy-load bearing and flexible rotation adapt to large motor relocation. Compared with traditional cooperative operation of multiple jacks (prone to deviation), the efficiency is increased by 50%, reducing workshop equipment scheduling time.
Scenario Requirement: Adjust an 8T railway turnout (turnout bottom clearance 26mm), requiring precise positioning of the turnout angle, and rust-resistant stability in outdoor humid environments.
Operation Process:
- Two people carry the YD21-012 to the bottom of the turnout; the 30mm toe height extends into the gap, and lift the turnout to a height of 200mm.
- Rotate the 360° housing to adjust the turnout docking angle, calibrate the position with a level, and switch to head support to a height of 500mm for fixing.
- Workers fasten the turnout bolts; the whole process takes 2.5 hours with no ram rust (rust resistance rating IP65), and controlled descent ensures smooth turnout reset.
Result: 360° rotation simplifies angle adjustment, and the rust-resistant design adapts to outdoor humid environments. Compared with traditional tools (requiring repeated lining), the adjustment precision is increased by 40%, ensuring safe docking of railway turnouts.
A1: The overload protection will be triggered, and lifting is not recommended. The rated load capacity of the YD21-011 is 5T, with an overload protection threshold of 5.5T. Although 5.2T does not exceed the threshold, it is close to the safety upper limit: during lifting, the safety valve may frequently fluctuate between "oil cut-off and recovery", leading to unstable ram lifting and lowering; moreover, the reversed ram of the 5T specification bearing a 5.2T load for a long time will accelerate the aging of seals (service life reduced from 5 years to 2.5 years), increasing equipment maintenance costs. To lift 5.2T equipment, models such as the YD21-012 (10T load capacity) and above should be selected.
A2: It is mostly caused by impurity blockage between the housing and the base, insufficient lubrication, or rust on the rotating bearing. Troubleshoot in the following steps:
- Clean impurities: Turn off the jack, use a brush to clean dust, iron filings, and other impurities at the connection between the housing and the base; if impurities are tightly stuck, blow them out of the gap with compressed air (0.3MPa);
- Add lubrication: Apply lithium-based grease (industrial grade) to the rotating bearing, rotate the housing repeatedly 10 times to ensure uniform lubrication and relieve jamming;
- Treat bearing rust: If the bearing is rusted and causes jamming, disassemble the housing (a special wrench is required), polish the rust with sandpaper, apply anti-rust grease, reassemble, and test the rotation flexibility. Grease should be replenished every 3 months thereafter.
A3: Female workers can carry it easily through correct posture + auxiliary tools. The specific tips are as follows:
- Correct carrying posture: Hold the metal handles on both sides of the equipment (located in the middle of the housing) with both hands, bend the knees slightly and keep the waist straight, and stand up with the help of leg strength. Avoid bending over to carry with waist strength (which may cause lumbar muscle strain). This posture can reduce physical consumption by 30%;
- Use a carrying strap: Thread the wide carrying strap provided by the manufacturer through the handles, carry the strap over one shoulder, and use shoulder strength to share the weight—more convenient for short-distance (≤5 meters) carrying;
- Ground sliding assistance: If the distance from the tool room to the track is ≤10 meters, lay the jack flat on the ground, push it gently to the target position, then pick it up—saving 50% of effort compared to lifting it the entire time.
A4: It is mostly caused by blockage of the hydraulic throttle device, wear of the pressure relief valve core, or aging of hydraulic oil. The solutions are as follows:
- Clean the throttle device: Disassemble the pressure relief valve, rinse impurities (such as hydraulic oil residues) in the throttle hole with alcohol, dry it, and reassemble. Test whether the descent speed is restored to controllable;
- Check valve core wear: If the function still fails after cleaning, check whether the pressure relief valve core has scratches or deformation. If severely worn, contact the manufacturer to replace the original valve core (priced at 80-120 yuan/piece). Avoid using non-original accessories to prevent poor sealing;
- Replace hydraulic oil: If the hydraulic oil has been used for more than 1 year (or turns dark in color), drain the old oil, add 46# anti-wear hydraulic oil (industrial grade) to the scale line
