Product Description
GW 519 is a complete hydraulic seal kit engineered for manual pallet jack pump repair, compatible with Crown PTH-50 and select models from CAT Lift Trucks, Mitsubishi, and Nissan. It provides OEM-quality replacement seals including piston rod seals, wipers, O-rings, and buffer seals in NBR, FKM, and PTFE, supporting maximum system pressures up to 3000 PSI.
Specifications
Hydraulic
| Seal Material | Nitrile rubber (NBR), Fluorocarbon (FKM), PTFE, phenolic fabric |
| Buffer Seal Specification | Hydraulic-grade buffer seal using nitrile compound |
| O-Ring Material | NBR and FKM (fluoroelastomer) construction |
| X-Ring Material | NBR and FKM (fluoroelastomer) construction |
Material
| Back-up Ring Material | Industrial-grade thermoplastic |
Part Numbers
| Cross-Reference Part Numbers | Replaces CAT Lift Trucks OEM part numbers A000011624, A000000856, A000002252, A000000878, A000000871, A000000873, A000000876, A000000885, A000015827, A000002650, A000000829, A000000830, A000001754, A000000855, A000000827, A000000886; Mitsubishi Forklifts part numbers A000000856, A000001754, A000000885, A000000878, A000000827, A000002650, A000011624, A000000871, A000000829, A000015827, A000000855, A000000873, A000000830, A000000876; Nissan part number G095005H |
| OEM Part Number | GW 519 |
| Compatible Model | Crown PTH-50 hand pallet jack, serial number series 7-000000 and up |
| Supersedes | Equivalent to Crown full seal kit CR43023, interchangeable with GP519 |
Frequently Asked Questions
Q: Is GW 519 compatible with Crown PTH-50 pallet jacks?
A: Yes. GW 519 is engineered as an OEM-grade replacement for Crown PTH-50 hydraulic pump seals. It is also cross-compatible with select models from CAT Lift Trucks, Mitsubishi Forklifts, and Nissan material handling equipment. Always check your exact model and serial range against the CAT, Mitsubishi, or Nissan OEM part list to confirm fitment.
Q: What CAT Lift Trucks and Mitsubishi part numbers does GW 519 replace?
A: GW 519 replaces these CAT OEM parts: A000011624, A000000856, A000002252, A000000878, A000000871, A000000873, A000000876, A000000885, A000015827, A000002650, A000000829, A000000830, A000001754, A000000855, A000000827, A000000886. Mitsubishi Forklifts part numbers are listed in the complete specification sheet. Cross-reference your equipment part plate with the replacement matrix before ordering.
Q: What sealing components are included in GW 519?
A: GW 519 is a complete pump seal kit containing piston rod seals (primary pressure seals), wiper seals (contaminant exclusion), O-rings (secondary retention), and buffer seals (pressure relief). Materials include NBR nitrile rubber, FKM fluoroelastomer (for high-temperature duty), and PTFE backup rings. All seals are OEM-equivalent specification.
Q: How do I diagnose pump seal failure in Crown or CAT equipment?
A: Look for these signs: sluggish or incomplete lift, visible hydraulic fluid leaking from pump housing or connection ports, hissing noise during pump operation, or fluid discoloration (brown or burnt appearance). Perform a pressure test at the gauge port to confirm if system pressure is below 2500 PSI at full load. If pressure is low and seals are visible, inspect for cracks or hardened material.
Q: What is the maximum working pressure and lifespan of GW 519?
A: GW 519 is rated for 3000 PSI hydraulic systems. Under normal industrial operation (regular warehouse use), seals typically perform for 2 to 4 years. Heavy-duty applications (continuous operation, extreme temperatures, or poor fluid maintenance) reduce lifespan to 1 to 2 years. Use only manufacturer-approved hydraulic fluid and maintain clean filters to maximize seal life.
Q: Does GW 519 installation require special equipment or training?
A: Yes. GW 519 pump seal replacement requires complete pump disassembly, which is not a field-service task for untrained personnel. You will need seal installation tools, precision measurement devices, and knowledge of seal orientation (lips must face the correct direction for each component). Crown, CAT, and Mitsubishi recommend factory or certified technician service for pump seal replacement.
