HYDRAULIC FILTERS

Hydraulic Filters For Peterbilt Trucks

Hydraulic filters protect the hydraulic systems found on vocational Peterbilt trucks — including PTO-driven hydraulic circuits for dump bodies, wet kits, and liftgates — by removing particulate contamination that accelerates pump and valve wear. Hydraulic system cleanliness directly affects component life, and a clogged or bypassing filter can allow debris to damage precision hydraulic components that are costly to repair. We carry return-line, pressure-side, and suction filters for common hydraulic circuit configurations on Peterbilt vocational trucks.

Frequently asked questions about hydraulic filters

How often should hydraulic filters be changed on a Peterbilt dump truck or vocational application?

Hydraulic filter service intervals for vocational Peterbilt trucks depend on operating conditions and the hydraulic system's cycle frequency. As a general guideline, hydraulic filters should be changed at every 500 hours of hydraulic operation or annually, whichever comes first — more frequently if the system operates in dusty environments or if oil analysis shows elevated particulate levels. New or freshly rebuilt hydraulic systems should have filters changed at a shorter initial interval (typically 50–100 hours) to remove break-in debris before it accumulates to damaging levels.

What micron rating should I use for a Peterbilt hydraulic system filter?

Hydraulic filter micron rating selection depends on the sensitivity of the hydraulic components in the circuit. Systems with high-pressure piston pumps or servo valves typically require finer filtration (10 micron or finer) to protect precision internal clearances. General-purpose gear pump circuits used in dump and PTO applications are often adequately served by 25-micron filters on the return line. Consult your hydraulic system manufacturer's specifications — using a filter that is too fine for the system can cause excessive pressure drop and bypass, while too coarse a filter provides inadequate protection.

What is the difference between a return-line and a pressure-side hydraulic filter?

Return-line filters are installed on the low-pressure return side of the circuit, filtering oil as it flows back to the reservoir after doing work. They are the most common filter position in mobile hydraulic systems because they capture wear debris and contamination from throughout the circuit before it recirculates. Pressure-side (high-pressure) filters are installed downstream of the pump and must withstand full system pressure — they provide protection for sensitive downstream components but are more expensive and create a pressure drop that must be accounted for in system design. Most vocational truck hydraulic systems use return-line filtration as the primary filter position.

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