Union Special XF500 series sewing machine

Union Special XF500 series sewing machine

Basic Information

Applicable models: covering more than 20 models in the three sub series of XF500 series, classified by needle count:

Single needle models: XF511 series (such as XF511B100MF, XF511H100MG, etc.), suitable for light to medium fabrics;

Double needle models: XF512 series (such as XF512E100HB, XF512E100MP), featuring medium and heavy-duty fabric seams;

Three needle models: XF513 series (such as XF513E100HJ, XF513E100HR), suitable for heavy-duty fabrics (such as denim, workwear).

Core positioning: High speed flat bed double lock sewing machine, designed for factory/industrial sewing scenarios, with industrial grade configurations such as fully enclosed drive mechanism and forced lubrication, balancing sewing efficiency and durability.

Core configuration and key parameters of the product

（1） Core configuration

The role of key characteristics in configuration categories

The drive mechanism is fully enclosed and equipped with a curved needle drive to prevent dust and dirt, extending its service life

The lubrication system is fully automatic with forced lubrication, equipped with replaceable oil filters to continuously lubricate key components and reduce wear

The protective device independently drives the needle guard and safety guard to ensure safe operation and prevent suture entanglement

Heat dissipation design for some models (XF511H series) with built-in oil cooler suitable for high-speed and long-term operation

Special Function Power "AIR-KLIPP" Chain Cutting Machine, Puller Puller for Automatic Wire Cutting, Ensuring Straight Line of Long Seam

（2） Key technical parameters

Parameter Category Core Value Remarks

Sewing speed 6500-9000 R.P.M. XF511H100MF maximum 9000 R.P.M

Needle spacing range 7-14 S.P.I. Single needle models 7-10 S.P.I., some models 10-14 S.P.I

Suitable for needles with 108 GHS, 128 GAS, and 128 GBS sizes of 70/027 (fine) -170/067 (thick)

The working voltage is not clearly indicated, and the lubrication system of the industrial sewing power supply relies on machine power drive

Low inertia presser foot, narrow edge feeding presser foot, etc. are suitable for different fabrics and sewing needs

Lubricating oil Saybolt viscosity 90-125 (100 ° F) Mineral oil meets Union Special specification 175

Installation and lubrication specifications

（1） Installation requirements

The machine needs to be placed on a horizontal workbench, and protective components such as battery protection strips and fixed brackets used during transportation should be removed before installation;

Ensure good ventilation in the work area, reserve sufficient operating space, and install protective covers and safety shields in place;

Check the fastening status of all connecting components (such as needle bars, bent needles, and feeding teeth), and tighten the screws according to the torque requirements in the manual.

（2） Lubrication operation (core maintenance item)

Oil specification: Union Special specification 175 mineral oil with Saybolt viscosity of 90-125 (100 ° F) must be used, and mixing with other types of oil is prohibited;

Refueling steps: Remove the refueling cap (A in Figure 1), refuel to the TOP line of the oil level gauge (B in Figure 1), and tighten the refueling cap;

Operation after new machine/long-term shutdown: Run at low speed (300 R.P.M.) for 5 minutes, observe whether the oil flow indicator rises steadily, and confirm that the oil circulation is normal;

Oil change and filter replacement:

Oil change cycle: no more than 1 year, with 2 drain plugs in the oil pan;

Oil filter replacement: It must be replaced every time the oil is changed. Remove the 4 screws (C in Figure 1) and cover plate (D in Figure 1), take out the old oil filter, move the bypass valve from the old oil filter to the new oil filter, and assemble it in reverse.

Key component adjustment process

（1） Needle bar adjustment

Height adjustment: When the curved needle tip is aligned with the left side of the right needle, the top of the pinhole should be 1/64 inch (. 4mm) lower than the lower surface of the curved needle blade;

Alignment adjustment (dual/three needle models): The top of the needle bar is approximately 1 7/8 inches (47.6mm) from the top of the upper needle bar bushing, ensuring that the needle is centered in the needle plate hole. Torque requirements: 10-12 in lbs for early models and 16-18 in lbs for later models;

Taboo: The needle bar has a special coating and must not be pried with tools to avoid damage.

（2） Bending needle adjustment

Single needle model: When the bent needle is at the far right end, the distance from the needle centerline is 5/32 inch (4.0mm), and the maximum gap between the bent needle and the needle during operation is. 002 inch (. 051mm);

Double/Three Needle Models: The distance between the centerline of the right curved needle and the right needle varies depending on the model, and is 1/8 inch (3.2mm) or 5/32 inch (4.0mm), requiring the use of a specialized gauge (such as 21225-5/32);

Synchronous adjustment: Ensure that the distance between the needle and the curved needle is consistent when the machine rotates in both directions, with a deviation of no more than one scale.

（3） Adjustment of fabric delivery system

Feeding tooth height: At the highest position, the tooth tip is 3/64 inches (1.2mm) higher than the needle plate;

Front back/left to right alignment: The feeding teeth should be at the center of the needle plate groove, with even gaps on both sides, which can be fine tuned by adjusting the screws of the needle plate bracket;

Adjustment of fabric feeding height: Loosen the adjusting screw (A in Figure 19), rotate the adjusting disc (B in Figure 19), and turn it towards the operator to increase the fabric feeding height.

（4） Foot pressure and suture tension adjustment

Low inertia presser foot: When the needle bar is at its lowest point, there is a gap of 1/32 inch (. 8mm) between the top of the presser foot screw and the top of the slot. When the presser foot lever is lifted and released, the gap between the connecting rod and the presser bar guide plate is 1/16 inch (1.6mm);

Suture tension:

Needle stitch tension: Adjust to the minimum needle loop that can be pulled up to form a tight needle stitch;

Bending needle and thread tension: Maintain a slight tension to avoid the thread being too tight;

Tension release: When the presser foot is lifted to 1/8 inch (3.2mm), the tension disc begins to release and is fully released when fully lifted.

Special device operation instructions

（1） Power "AIR-KLIPP" chain cutting machine

Adjust parameters:

Cross cutting distance: The distance between the lower blade and the front end of the upper blade is 1/32 inch (. 8mm);

Shear angle: The gap between the lower blade and the upper blade is 0.003 inches (0.076mm);

Pressure regulation: The air motor operates at a pressure of 20-22 p.s.i. (1.5 bar), and the suction pressure is based on the non cutting fabric;

Replace blade: Remove 2 screws from the upper blade, and first remove the upper blade, back cover, and wire inlet from the lower blade. Ensure that the tension spring is inserted into the lower blade hole during installation.

（2） Puller (Belt/Roller type)

Tension adjustment: The deflection of the traction drive belt when pressed is about 1/8 inch (3.2mm), which is adjusted by an eccentric wheel;

Needle spacing combination: With 9 different combinations of sprockets, 59 needle spacings can be achieved, with a default needle spacing of approximately 9.2 S.P.I. for the model;

Timing adjustment: The intermittent feeding of fabric by the tractor needs to be stopped before the needle enters the fabric, by adjusting the position of the sprocket on the shaft.

Preventive Maintenance and Safety Rules

（1） Preventive Maintenance Schedule

table

Core tasks of maintenance cycle

Daily check of oil level (between red lines), pump operation status, cleaning of machine lint, and inspection of protective covers

Replace the oil filter and oil after the first month

Clean the oil cooler and motor air duct monthly

Check the clutch/motor V-belt tension and clutch/brake every 3 months

Change the engine oil and check the internal timing belt tension every 6 months

Annual comprehensive inspection of timing belt wear and component fastening status

（2） Safety operation rules

threading、 Before refueling, adjusting or replacing parts, all power sources must be turned off;

Safety goggles must be worn during operation, and all protective covers and shields must be installed in place. Tampering with safety devices is prohibited;

It is prohibited to directly control actuators without safety protection using machines to avoid danger caused by malfunctions;

When operating with electricity, operators need to first perform electrostatic discharge treatment to prevent static electricity from damaging components.

Parts and accessories information

Parts diagram and index: The document includes exploded diagrams of all components such as lubrication system, needle drive, feeding mechanism, presser foot, special device, etc., with part numbers, names, and quantities marked, such as lubrication system parts (C50093 series) and needle assembly (C50055 series);

List of vulnerable parts: needles, suture tension discs, feeding teeth, presser feet, seals (O-rings), oil filters, etc;

Special accessories:

Tools: Needle spacing adjustment wrench (21205B), screwdriver (21207B), tweezers (660-240);

Functional category: Knee control component (29480ADL), single/double/three pin dedicated wire holder (21101W series);

Lubrication: 32 oz (946ml) specialized oil, tubing (C50094 series), oil filter (C50093CA).