Product Description
Master cylinder
Frequently Asked Questions
Q: What is the SY85604 master cylinder used for and which forklift brands is it compatible with?
A: The SY85604 is a master cylinder for hydraulic braking systems on forklifts. It pressurizes brake fluid when the operator applies the brake pedal. The SY85604 fits multiple forklift models from Crown, Toyota, Raymond, Yale, and Hyster. Verify the piston diameter, fluid port size, and mounting configuration match your equipment.
Q: What brake fluid type and capacity does the SY85604 master cylinder require?
A: Use ISO 4414 or equivalent hydraulic brake fluid as specified by the forklift manufacturer. Fluid capacity depends on piston diameter and reservoir size; typical capacity ranges from 0.5 to 1.5 liters. Always use the correct fluid type to prevent seal degradation and brake system failure. Never mix fluid types.
Q: How do I know if the SY85604 master cylinder is failing?
A: Symptoms of master cylinder failure include soft or spongy brake pedal, reduced braking power, brake fluid leakage around the cylinder, or metal contamination in brake fluid. If the pedal does not return to full position or requires excessive force, the internal seals may be damaged. Immediate replacement is required to restore safe braking.
Q: What materials are used inside the SY85604 master cylinder and how long do seals last?
A: The SY85604 uses hardened steel bore with synthetic elastomer seals. Under normal operating conditions, seals typically last 3 to 5 years. Seal life depends on brake usage frequency, hydraulic fluid quality, and maintenance. Contaminated fluid accelerates seal degradation and requires premature replacement.