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Toro 109-3321 OEM Hydraulic Oil Filter
The Toro 109-3321 Hydraulic Oil Filter is a genuine OEM hydraulic filter element used in select Toro and Exmark hydrostatic drive systems. This part is commonly listed in Toro and Exmark parts diagrams as ELEMENT-OIL FILTER, HYD.
This hydraulic filter helps protect hydro pumps, transmissions, transaxles, and related drive components by filtering contaminants from the hydraulic oil. Replacing the hydro filter during scheduled service helps support smooth drive operation, proper hydraulic flow, and long-term hydro system reliability.
Always verify your full model number, serial number, original filter part number, hydro assembly number, and parts diagram before ordering. Hydraulic filter fitment can vary by model, serial range, transmission style, and production year.
Product Details
| Brand | Toro / Exmark |
|---|---|
| Part Number | 109-3321 |
| OEM Description | Element-Oil Filter, HYD |
| Product Type | Hydraulic Oil Filter Element |
| Common System | Hydrostatic drive / hydraulic transmission system |
| Length | 4.000 in. |
| Width | 4.100 in. |
| Height | 4.300 in. |
| Weight | 0.612 lb. |
| OEM / Aftermarket | Genuine OEM Toro / Exmark replacement part |
Compatible Toro and Exmark Model Families
Toro 109-3321 is used on many Toro and Exmark hydrostatic drive applications. Use the model families below as a fitment guide only. Always confirm your exact model and serial number in the correct parts diagram before ordering.
- Toro Z Master 300 Series
- Toro Z Master Commercial 2000 Series
- Toro Sub-Compact Z Master models
- Toro TITAN Z, TITAN ZX, TITAN MX, TITAN HD, TITAN MAX, and TITAN MyRIDE models
- Toro TimeCutter and TimeCutter HD models
- Toro Quest and Quest SP models
- Toro Stand-On Aerator models
- Toro ProLine Commercial Walk-Behind models
- Exmark Phazer models
- Exmark Quest and Quest SP models
- Exmark Pioneer E-Series and Pioneer S-Series models
- Exmark Radius E-Series, Radius S-Series, and Radius X-Series models
- Exmark Z-Spray and Z-Aerate models where specified
Important: This filter appears across many different hydro assemblies and serial ranges. Do not order by model name alone. Verify part number 109-3321 in your exact Toro or Exmark parts diagram before ordering.
Common Toro Model References
Click/tap to view major Toro model references
- 34" Sub-Compact Z Master 74408
- 40" Sub-Compact Z Master 74409
- Z334 Z Master 74408CP
- Z340 Z Master 74409CP and 74409TE
- TITAN Z4800 and TITAN Z5200 models
- TITAN ZX4800, ZX5000, ZX5400, ZX5450, ZX6000, ZX6030, and ZX6050 models
- TITAN MX4800, MX4880, MX5400, MX5480, MX6000, and MX6080 models
- TITAN HD 1500, HD 2000, and HD 2500 Series models
- TITAN MyRIDE, TITAN MAX, TITAN ZXM, and TITAN MR models
- TimeCutter MX, SWX, HD, HD MyRIDE, HD ZX, TimeCutter 6000, TimeCutter Max, and TimeCutter MyRIDE models
- Z Master Commercial 2000 Series 48", 52", and 60" models
- ProLine Commercial Walk-Behind 36", 48", 54", and 60" models
- 24" and 30" Stand-On Aerator models
Common Exmark Model References
Click/tap to view major Exmark model references
- Phazer models
- Quest models
- Quest SP models
- Pioneer E-Series models
- Pioneer S-Series models
- Radius E-Series models
- Radius S-Series models
- Radius X-Series models
- Z-Aerate models
- Z-Spray models
Key Features
- Genuine OEM Toro / Exmark hydraulic oil filter
- Part number 109-3321
- OEM description: Element-Oil Filter, HYD
- Used in select hydrostatic drive and hydraulic transmission systems
- Fits many Toro Z Master, TITAN, TimeCutter, Quest, and aerator applications where specified
- Fits many Exmark Phazer, Quest, Pioneer, Radius, Z-Spray, and Z-Aerate applications where specified
- Helps filter hydraulic oil and protect hydro components
- Recommended during hydro oil service when listed in the service schedule or parts manual
- Factory-correct replacement when shown in your Toro or Exmark parts diagram
Why Replace the Hydraulic Oil Filter?
Hydraulic oil filters help remove contaminants from the hydrostatic drive system. Over time, hydraulic oil can collect debris, metal particles, and normal wear material. A restricted or overdue filter may reduce hydro performance and place extra stress on pumps, transaxles, and transmission components.
Replacing the hydraulic filter during scheduled hydro service helps support proper oil flow, smoother drive response, and better long-term system protection. Always use the correct hydraulic oil and filter specified for your exact machine.
- Helps filter contaminants from hydraulic oil
- Supports hydro pump and transaxle protection
- Helps maintain smooth drive response
- Recommended during hydraulic oil service where specified
- Important for commercial and heavy-use zero-turn applications
When to Replace a Hydraulic Filter
Replace your hydraulic filter according to the maintenance schedule for your mower or whenever hydro system service is being performed. A clogged, damaged, or overdue hydraulic filter may contribute to poor drive response or reduced hydraulic system performance.
- Hydro oil service is due
- Hydraulic oil is contaminated or being changed
- Drive response feels weak or inconsistent
- Hydro system has been repaired or opened
- Filter is leaking or damaged
- Parts manual lists Toro 109-3321 for your machine
Important Fitment Notes
- Model name alone is not enough to confirm fitment
- Serial number ranges matter on Toro and Exmark hydro parts
- Some models use different left-hand and right-hand hydro assemblies
- Some diagrams show this filter inside RH transmission, RH transaxle, or RH hydro assembly sections
- Always verify the original part number before ordering
- Use the correct Toro or Exmark hydraulic oil for your machine
Pre-Purchase Checklist
Before ordering Toro 109-3321, confirm:
- Your full Toro or Exmark model number
- Your mower serial number
- Your original hydraulic filter part number
- Your hydro transmission or transaxle assembly number
- Your parts manual lists 109-3321 for your exact unit
- Your hydraulic oil type and service interval are correct
- You are ordering the correct filter quantity for your hydro service
Service Notes
Hydraulic filter replacement should be performed according to the service manual or operator’s manual for your exact Toro or Exmark model. Always service the machine on a level surface, allow the system to cool, and keep dirt out of the hydraulic system.
- Clean around the filter before removal
- Use the correct hydraulic oil specified by Toro or Exmark
- Follow the correct fill and purge procedure
- Check the hydraulic oil level after service
- Inspect for leaks after installation
- Do not run the hydro system low on oil
Part Number / Search Terms
Toro 109-3321 may also be searched as:
- Toro 109-3321
- 109-3321 hydraulic filter
- 109-3321 hydro filter
- Toro hydraulic oil filter
- Toro hydraulic filter
- Toro hydro filter
- Toro element oil filter hyd
- Toro Z Master hydraulic filter
- Toro TITAN hydraulic filter
- Toro TimeCutter hydraulic filter
- Toro Quest hydraulic filter
- Toro stand-on aerator hydraulic filter
- Exmark hydraulic oil filter
- Exmark hydraulic filter
- Exmark hydro filter
- Exmark Quest hydraulic filter
- Exmark Pioneer hydraulic filter
- Exmark Radius hydraulic filter
- Exmark Phazer hydraulic filter
- Exmark Z-Spray hydraulic filter
- Exmark Z-Aerate hydraulic filter
Frequently Asked Questions
What is Toro 109-3321?
Toro 109-3321 is a genuine OEM hydraulic oil filter element used in select Toro and Exmark hydrostatic drive systems.
Is Toro 109-3321 the same as a hydro filter?
Yes. This part is commonly referred to as a hydraulic oil filter, hydro filter, or hydraulic filter element.
Does Toro 109-3321 fit Toro Z Master and TITAN models?
Toro 109-3321 fits select Toro Z Master, TITAN, and related zero-turn mower models where it is listed in the parts diagram. Always verify by model and serial number.
Does Toro 109-3321 fit Exmark models?
Yes, this filter is used on select Exmark Phazer, Quest, Pioneer, Radius, Z-Spray, and Z-Aerate models where specified in the parts manual.
How do I know if this hydraulic filter fits my mower?
Verify your full model number, serial number, original filter part number, hydro assembly number, and parts diagram. Hydro filter fitment can vary by model and serial range.
Is this an OEM Toro hydraulic filter?
Yes. This listing is for a genuine OEM Toro / Exmark hydraulic oil filter element.
P&P Small Engines stocks Toro and Exmark hydraulic filters, hydro filters, oil filters, belts, blades, spindles, pulleys, maintenance parts, and OEM replacement parts to help keep your mower ready to work.
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