Product Description
Idler caster assembly with high-durability XL 97A polyurethane wheel, designed as a direct-fit replacement component for electric lift truck applications. Manufactured by Liftsplus.com under part number SU 684-XL. No cross-reference or superseded part numbers available.
Specifications: 8.000 inch diameter x 4.000 inch width (8.000" x 4.000" | 8 x 4 wheel | 8 x 4 | 203.20mm x 101.60mm)
Specifications
Material & Construction
| Wheel Material | Polyurethane, XL 97A hardness |
| Hardness Rating | 97A Shore durometer |
Part Numbers
| Manufacturer Part Number | SU 684-XL |
| OEM Part Number | SU 684-XL |
Wheel Dimensions
| Outside Diameter | 8 |
| Inside Diameter | 2.25 |
| Width Side to Side | 4 |
| Bore Depth | 0.63 |
| Bore Outside Diameter | 2.4404 |
Frequently Asked Questions
Q: What are the dimensions and hardness rating of the SU 684-XL idler caster assembly?
A: The SU 684-XL is an 8 inch outside diameter by 4 inch width idler caster assembly featuring XL 97A Shore durometer polyurethane. The inside diameter is 2.25 inches with a 2.4404 inch bore outside diameter and 0.63 inch bore depth. The high hardness rating of 97A provides excellent load capacity and durability in demanding material handling environments while maintaining floor contact.
Q: What equipment types is the SU 684-XL idler caster compatible with?
A: The SU 684-XL is engineered as a direct-fit idler caster replacement for electric lift trucks used in manufacturing, warehousing, and distribution centers. This assembly fits multiple brands including Crown, Toyota, Raymond, Yale, Hyster, Jungheinrich, Linde, Clark, Mitsubishi, CAT, and BT equipment. Verify your truck model accepts an 8 x 4 inch caster dimension and has a matching bore configuration before ordering.
Q: How does the 97A hardness polyurethane perform compared to softer compounds?
A: The XL 97A polyurethane at 97 Shore durometer is a high-hardness compound designed for maximum load capacity and extended tire life on hard surfaces. Compared to softer compounds (70-85A range), the 97A material resists deformation under continuous heavy loads, generates lower rolling resistance for improved battery efficiency on electric trucks, and resists floor debris and punctures. The trade-off is reduced traction on wet or oily surfaces and slightly increased vibration transmission.
Q: What is the installation procedure for the SU 684-XL idler caster?
A: Position the lift truck on level ground. Use a hoist to lift the truck and access the idler caster location. Remove the fasteners securing the old caster assembly to the truck frame. Disconnect the caster from the mounting bracket. Align the SU 684-XL caster bore with the axle shaft on the mounting bracket and slide it into position. Reinstall all fasteners and torque to the manufacturer specification. Verify the caster rotates smoothly and is properly aligned before lowering the truck.
Q: How long does an SU 684-XL idler caster typically last in service?
A: With proper maintenance and moderate use on hard indoor floors, the SU 684-XL typically lasts 18-36 months. Heavy continuous use, sharp turns, outdoor surfaces, or rough handling will reduce lifespan to 12-18 months. Regular inspections every 3-6 months for wear, debris removal, and bearing lubrication extend the serviceable life. Replace the caster when tread wears flat, the wheel loses roundness, or bearing movement becomes loose.