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Description
144-6603 – Toro Filter Kit | Genuine Toro OEM Replacement
Overview
The Toro 144-6603 Filter Kit is a genuine Toro OEM hydraulic filter kit designed for use in Toro SprayMaster® and Z Master® 4000 Series commercial equipment. This kit plays a critical role in maintaining clean hydraulic fluid, protecting left-hand (LH) and right-hand (RH) transaxle assemblies, and ensuring smooth, reliable machine operation.
Built to Toro factory specifications, the 144-6603 filter kit helps reduce internal wear, prevent contamination-related failures, and extend the overall service life of hydraulic drive systems.
Product Details
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Brand: Toro
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Manufacturer Part Number: 144-6603
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Part UID: 585550
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Part Type: Hydraulic Filter Kit
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Description: KIT, FILTER
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System: Hydraulic / Transaxle
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OEM Status: Genuine Toro OEM
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Inner Diameter (ID): 1/2"
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Outer Diameter (OD): 2-5/8"
Function
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Filters hydraulic oil to remove debris and contaminants
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Protects LH & RH transaxle assemblies
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Ensures consistent hydraulic pressure and drive performance
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Helps prevent premature transaxle wear
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Supports long-term reliability in commercial-duty equipment
Compatibility
The Toro 144-6603 Filter Kit is commonly used on:
Toro Spray Equipment
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SprayMaster® 46"
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SprayMaster Max® 52"
Toro Z Master® 4000 Series
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52" Z Master 4000 Series
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60" Z Master 4000 Series
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Models using:
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LH Transaxle Assembly No. 138-6076
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RH Transaxle Assembly No. 138-6077
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⚠️ Compatibility depends on model number and serial range. Always confirm your exact model and serial number before ordering.
Replaces / Cross-Reference Numbers
The Toro 144-6603 Filter Kit replaces or is compatible with the following part numbers:
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Toro: 144-6598, 144-6603
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Bad Boy: 063-1070-00
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Bobcat / Ransomes: 4176892
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Ferris: 5101987X2
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Gravely: 21548300
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Hydro-Gear: 71943, 72537
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Scag: HG71943
How It’s Used
This filter kit installs directly into the hydraulic transaxle system and is typically replaced during scheduled hydraulic service intervals. Proper installation ensures clean fluid flow and optimal hydraulic response.
Always follow Toro service manual instructions when replacing hydraulic filters.
Suggested Maintenance
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Replace hydraulic filters at manufacturer-recommended intervals
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Inspect hydraulic fluid condition during filter changes
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Replace filters on both LH and RH transaxles simultaneously
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Check for leaks after installation
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Use genuine Toro filters for best performance and longevity
