Lockwasher for Manual Pallet Jack

Frequently Asked Questions

Q: What manual pallet jack models use the 4942101 lock washer?
A: The 4942101 is a stainless steel lock washer used in pump assemblies and hydraulic valve connections on manual pallet jacks from Crown, Toyota, and Mitsubishi. Verify bore diameter and fastener size match your equipment before ordering.

Q: What are the dimensions and material specifications of the 4942101?
A: The 4942101 is a split-ring or toothed lock washer manufactured from 300-series stainless steel, typically sized for 1/2-inch to 5/8-inch fasteners. It is rated for 5000 to 8000 PSI hydraulic system pressure and provides positive locking under vibration.

Q: Why is a lock washer needed in manual pallet jack hydraulics?
A: Lock washers prevent fasteners from loosening due to vibration and pressure cycling in the hydraulic system. Loose fasteners cause hydraulic fluid leaks, loss of lift pressure, and potential pump failure. The 4942101 maintains bolt preload during operation.

Q: What happens if a lock washer is missing or damaged?
A: Without a lock washer, fasteners gradually back out, causing hydraulic fluid seepage at pump and valve connections. This results in reduced lift capacity, slow pump response, contamination from air ingress, and eventual system failure if not corrected.

Q: How long do stainless steel lock washers last?
A: Stainless steel lock washers like the 4942101 last the lifetime of the pallet jack if properly installed. However, they should be replaced whenever a pump or valve assembly is serviced, as deformation during removal compromises locking ability.