Product Description
220028078 Crown Seal Kit is a direct-fit hydraulic seal replacement assembly engineered for Crown PTH manual pallet jacks, superseding Crown part 44648 and compatible with serial range 3-118400 to 3-183849. Kit features NBR and polyurethane seals for restoring maximum hydraulic pressure integrity in high-cycle warehouse pallet truck operation.
Specifications
Compatibility
| Compatible Models | Crown PTH manual pallet jacks (serial range 3-118400 to 3-183849), Crown PTH-50 |
Dimensional
| Reference Drawing Number | 220028078, supersedes CR 44648 component assembly |
Material & Construction
| Seal Material | Nitrile (NBR) and polyurethane energized elastomer seals |
| O-Ring Material | Nitrile (Buna-N) NBR per SAE J200 |
| Backup Ring Material | Polyurethane per ASTM D4065 |
Part Numbers
| Manufacturer Part Number | 220028078 |
| Cross-Reference Part Numbers | Direct replacement for Crown 44648, equivalent to CR 44648 |
Frequently Asked Questions
Q: What Crown manual pallet jacks does the 220028078 seal kit fit?
A: The 220028078 is a direct-fit hydraulic seal kit for Crown PTH manual pallet jacks with serial range 3-118400 to 3-183849. It also fits Crown PTH-50 models. Verify your serial number before ordering to ensure compatibility.
Q: What Crown part does the 220028078 replace?
A: The 220028078 is a direct replacement for Crown part 44648 and is equivalent to cross-reference CR 44648. This seal kit assembly restores hydraulic system integrity without requiring additional components.
Q: What materials are in the 220028078 seal kit?
A: The 220028078 features NBR (nitrile) and polyurethane seals engineered for hydraulic pressure service. These materials provide reliable sealing across the operating temperature range and resist degradation from standard hydraulic fluids.
Q: What pressure rating does the 220028078 support?
A: The 220028078 seal kit is rated for restoring maximum hydraulic pressure integrity in Crown PTH pallet jacks operating under high-cycle warehouse conditions. The kit maintains pressure seal performance when installed correctly in compatible models.
Q: How long should the 220028078 seal kit last?
A: Seal lifespan depends on operating cycles, fluid maintenance, and environmental conditions. In typical warehouse pallet jack service, hydraulic seals last 2 to 4 years. Regular fluid changes and proper storage extend seal life and prevent premature degradation.
Q: What symptoms indicate the 220028078 seals need replacement?
A: Signs of worn seals include slow lifting, loss of pressure during loaded cycles, hydraulic fluid leaks around the pump housing, or inability to hold load. These symptoms indicate the seal kit needs replacement to restore hydraulic performance.