V-belt XPB 3750 - 17x14MM - PIX X'tra ®

V-belt XPB 3750 - 17x14 MM - PIX X'tra ® with Li 3690 mm, Ld 3750 mm and La 3778 mm

V-belt XPB 3750 - 17x14 MM - PIX X'tra ® is a rough-edged and timing narrow V-belt in XPB profile for mechanical power transmission in V-belt drives. The belt is specified with profile XPB, goal 17x14MM, Ld 3750mm, Li 3690mm and La 3778mm.

XPB is a more heavily timing narrow V-belt, often used when more power is to be transmitted than in the smaller XPZ and XPA profiles. The practical advantage of the correct profile is that the belt should neither bottom out in the groove nor be too high. When the profile fits, the load is better distributed on the sides of the belt, and the belt drive has a better chance of running smoothly.

Product data

• Profile: XPB
• Goal: 17x14MM
• Effective length: Length 3750 mm
• Inner length: L 3690 mm
• External length: Width 3778 mm
• Series: PIX X'tra® Molded Raw Edge Cogged Belts
• Construction: raw edge and Cogged V-belts
• Profile angle according to PIX data sheet: 36° ± 1°
• Mark: PIX

Length specifications

The three length specifications describe the belt's geometry from each measurement position. L 3690 mm describes the inner length, Length 3750 mm is the effective length, and Width 3778 mm is the outer length. The difference between them is due to the geometry of the belt and the measurement method. Therefore, belts with almost the same outer dimensions can still have different technical specifications.

When a belt is specified from an older marking, it is usually best to compare both the letter profile and length designation. A belt marked as XPB 3750 should not be confused with another profile of the same nominal length. Therefore, consider both Li, Ld and La along with the profile and dimensions.

With Ld 3750 mm, the belt is a very long variant in this product group. Long belts require special attention to alignment, correct tensioning and the quality of the pulleys, because small deviations can propagate over a larger belt length.

Construction and technical features of PIX X'tra®

The PIX data sheets describe the construction with a special textile/fabric layer as a cover, a cushion rubber compound around the belt's working area, polyester cord as a tensile member and an EPDM-based compression part. In practice, this means that the belt should not only be assessed on its length. The internal construction is important for strength, flexibility, heat management and stability under load.

The main technical features of the PIX series are the timing flexibility, higher heat dissipation than a classic wrapped belt and the possibility of working in compact belt drives when the rest of the drive is correctly dimensioned. The series is also specified as antistatic, oil and heat resistant and REACH and RoHS compliant. These features are particularly relevant in machines where the belt runs for many times and is not only used occasionally.

For the XPB profile, the PIX data sheet states the length range is 550–8380 mm. This belt with Ld 3750 mm is in the range 3001–8380 mm, where the data sheet states a length tolerance of ±8 mm and a set tolerance of 4 mm. The tolerances are relevant when replacing, especially if several belts are to run in parallel or if the center distance can only be adjusted to a limited extent.

Use for the XPB profile

If the machine has previously used a regular wrapped V-belt, a timing raw edge type may be interesting for compact drives or when greater flexibility is needed. This does not mean that all belts can be freely replaced. The safe method is to maintain the same profile family, assess the length and ensure that the pulleys are suitable for the specified belt type.

In practice, this type of belt is often used for more powerful belt drives, where the motor, pu , fan, compressor or process machine requires a wider contact surface. However, the belt should not be selected solely based on the machine type. Two machines can use different profiles, even if they look similar from the outside. The correct check is therefore the product name, belt marking, the pulley profile and the three length measurements.

Profile and pulley compatibility

XPB belongs to the same narrow profile family as SPB, but the belt has its own technical specification with a timing, raw-edge construction. The belt works with side contact in the pulley groove, and the correct groove profile is necessary for the contact surface, friction and load to be distributed correctly. Incorrect cross-section or skewed pulleys can cause overheating, noise, slippage and uneven wear.

The technical identification consists of the combination XPB, 17x14MM, Length 3750 mm, L 3690 mm, Width 3778 mm and PIX X'tra®The combination distinguishes the item from nearby V-belts with other profiles, other length standards or a different construction.

Installation and operation

A new belt should be installed in clean, dry and undamaged pulleys. Oil, old belt dust, rust or sharp edges can shorten the life. Alignment between the pulleys is also important. Even a good belt can quickly wear out if the pulleys are misaligned or if the belt is forced to work sideways.

After start-up, it is wise to listen for abnormal noise and feel for abnormal heat when it is safe to do so. Slippage, whining, vibrations or black belt dust may indicate incorrect tension, incorrect profile, worn pulleys or excessive load. The fault should be found before the machine continues to run for a long time.

During continuous operation, the belt should be evaluated for ctiming bars, heavily worn side faces, glazing, frayed edges, and signs of overheating. If the belt repeatedly needs to be retensioned, it is often an indication that either the belt, the pulleys, or the setup itself should be examined. Replacing the belt alone does not always solve the cause of the problem.

The timing underside of the belt reduces bending stiffness and makes the design suitable for belt drives, where the belt must follow the pulleys without unnecessary energy loss. The raw-edge design provides direct side contact with the groove, and the polyester insert contributes to stable length under load. For the XPB 3750, the interaction between profile, length and pulley geometry is therefore central to smooth operation, correct tension and uniform wear over time.

Technical questions about XPB V-belts

What does XPB 3750 mean on this belt?

XPB is the profile designation and 3750 refers to the effective length Ld in millimeters. For this item, this means that the belt is specified as XPB profile with dimensions 17x14 MM, Li 3690 mm, Ld 3750 mm and La 3778 mm.

What do Ld, Li and La mean on this V-belt?

Ld is the effective length and is the length stated in the product name. Li is the inside length, and La is the outside length. The three measurements are used to compare belts because manufacturers and older belt markings do not always use the same length designation.

Is the length alone enough to describe the belt?

No. The length is important, but the profile is at least as important. A belt with the correct length but the wrong profile can lie incorrectly in the pulley, causing poor contact, heat, noise and a shorter life.

Why is the belt timing on the inside?

The serration makes the belt more flexible around the pulley and helps with heat dissipation. This is especially relevant for compact belt drives, smaller pulleys and operations where a stiffer wrapped belt can become unnecessarily hot.

Is PIX X'tra® a regular wrapped V-belt?

No. The PIX X'tra® in this series is a moulded raw edge cogged belt. It differs from classic wrapped belts in construction, flexibility and working surface.

When should the belt be replaced?

The belt should be replaced if there are ctiming bars, obvious side surface wear, frayed edges, glazing, squealing, vibrations or repeated retensioning. The pulleys should also be in good condition, as a new belt will wear quickly in damaged grooves.

An incorrect belt specification reduces the risk of unnecessary stops, repeated replacements and troubleshooting after installation. The right combination of profile, length and construction provides better conditions for smooth running, reasonable service life and more stable power transmission in the current belt drive.

Belt operation depends on the profile, length, tension and pulley groove matching. Worn or damaged grooves can shorten belt life, while correct alignment and a clean contact surface provide more stable power transmission.

Overall rating: V-belt XPB 3750 - 17x14 MM - PIX X'tra ® is specified with profile XPB, dimensions 17x14 MM, effective length Ld 3750 mm, inner length Li 3690 mm and outer length La 3778 mm. The belt belongs to the PIX X'tra® series and is designed as a raw-edged, Cogged V-belts for mechanical power transmission.