About Donaldson Hy-Pro
Hydraulic & Industrial Fluid Filtration SystemsDonaldson Company
Donaldson Hy-Pro, part of Donaldson Company's Industrial Fluid Power division, designs and manufactures world-class hydraulic and lubrication filtration systems for stationary and mobile equipment. Acquired by Donaldson in 2017, Hy-Pro brings specialized expertise in protecting hydraulic circuits, gearboxes, and industrial equipment by removing particulate contamination, water, and oxidation byproducts that accelerate fluid degradation and component wear.
The Donaldson Hy-Pro product lineup includes high-pressure in-line filter assemblies (PFH series for 2500+ PSI), medium-pressure spin-on filters (MF3 series to 1200 PSI), low-pressure offline filter carts (FC series), varnish removal cartridges, water-absorption elements, and integrated fluid conditioning units for bulk oil handling, reservoir maintenance, and equipment preventive flushing.
All Hy-Pro filtration products meet ISO 16889 efficiency ratings (typically 10 micron absolute, 99% efficiency minimum) and are engineered to handle continuous duty in harsh industrial environments—paper mills, steel plants, mining operations, and power generation facilities where fluid cleanliness directly impacts equipment reliability and operating cost.
The FC Filter Cart is Hy-Pro's flagship offline conditioning system, suitable for lower-viscosity hydraulic oil, lube oil, and diesel fuel transfer and cleaning. The cart includes circulation pump, filtration stages, and water-removal capability, enabling predictive maintenance flushing of equipment reservoirs without system shutdown.
ChatMRO connects maintenance engineers and fluid-power specialists instantly with Donaldson Hy-Pro filtration solutions—specify your equipment type, operating pressure, fluid type, and filtration cleanliness target (ISO 4406 code), and our AI surfaces matching filter cartridges, spin-on assemblies, and fluid conditioning systems from our indexed 30M+ component database.
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Frequently asked questions
What does ISO 4406 fluid cleanliness code (e.g., 16/14/11) mean?
ISO 4406 codes describe particle count per 100 mL at three size thresholds (>4 microns, >6 microns, >14 microns). Code 16/14/11 means more than 1,300 particles >4µ, 320 particles >6µ, and 20 particles >14µ per 100 mL. Higher numbers = dirtier fluid. Most hydraulic systems require 17/15/12 or cleaner; servo systems demand 15/13/10 or better. Donaldson filters are rated to achieve and maintain target ISO codes.
Should I filter my hydraulic system offline or with in-line high-pressure filters?
Both approaches are complementary. In-line high-pressure filters protect sensitive components (servo valves, proportional controls) from particle spikes during pump startup or component failures. Offline filter carts perform preventive maintenance, removing accumulated contamination and water during equipment idle time or planned maintenance windows. Industry best practice uses both.
How do I know when a hydraulic filter element needs replacement?
Most filter housings include clogging indicators (visual pop-up or electrical switch) that signal when differential pressure exceeds safe limits. Typical change intervals: high-pressure filters every 500–2000 hours depending on system contamination; offline cart filters every 50–100 operating hours; lube-oil filters annually. Always follow equipment manual guidance.
Can I mix different filter brands in the same system or must I use all Donaldson Hy-Pro?
Different brands can coexist, but using identical filter models across inlet/load/return stages ensures consistent micron ratings and prevents pressure bypass during element clogging. Hy-Pro's integrated system design optimizes compatibility; mixing brands risks pressure-relief activation if one stage bypasses prematurely due to different clogging characteristics.
What's the difference between a 10-micron absolute and a 10-micron nominal filter?
Absolute (10µ @99%) means 99% of particles >10 microns are captured—verified per ISO 16889 testing. Nominal is unverified and may be much less effective; particles bypassing absorb water and trigger oxidation. Always specify absolute ratings for mission-critical equipment; nominal is acceptable for general industrial service.