Toro Lawn-Boy Precision Z320H User Manual

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TimeCutter

®

Z / Precision

®

Z

Zero Radius Turn Riding Mower

Service Manual

Consumer Products

Table of Contents

Questions and Answers:

C
Catherine ColemanAug 8, 2025
Why does my Toro Lawn-Boy Precision Z320H have no power?
- P
  Paige EvansAug 8, 2025
  If your Toro Lawn Mower has no or low power, it could be due to several reasons. The engine speed might be too low, so adjust it to the correct setting. A bent or misaligned control linkage, a slipping drive belt, or a damaged pulley can also cause this issue; in these cases, repair or replace the linkage, drive belt, or pulley. Additionally, check the oil level and ensure it is at the proper level and not contaminated; change the oil if necessary. Excessive loading can also reduce power, so reduce the vehicle loading. Finally, a sticking bypass assembly or air trapped in the hydraulic system can be the cause; repair or replace the bypass or purge the hydraulic system.
J
Julian TaylorAug 12, 2025
What to do if Toro Lawn-Boy Precision Z320H is operating hot?
- J
  Joseph RodriguezAug 12, 2025
  If your Toro Lawn Mower is operating hot, it could be due to debris buildup around the transaxle; clean off any debris. A damaged cooling fan can also cause overheating; repair or replace it. Check the oil level and quality; fill to the proper level or change the oil if it's contaminated. Reduce vehicle loading if you are excessively loading the mower. Finally, air trapped in the hydraulic system can cause overheating, so purge the system.
N
Nicolas FreemanAug 17, 2025
Why is my Toro Lawn-Boy Precision Z320H Lawn Mower so noisy?
- H
  hburtonAug 17, 2025
  If your Toro Lawn Mower is making excessive noise, it could be due to several factors. Check the oil level and ensure it is at the proper level or change the oil if contaminated. Reduce vehicle loading if it's excessive. Loose parts can also cause noise, so repair or replace them. A sticking bypass assembly can be the culprit, so repair or replace the linkage. Air trapped in the hydraulic system can also lead to noise, so purge the hydraulic system.
P
Patrick DelgadoAug 22, 2025
What to do if my Toro Lawn Mower does not drive straight?
- A
  ashley34Aug 22, 2025
  If your Toro Lawn Mower is not driving or tracking straight, first check the vehicle tires and ensure they are inflated to the vehicle manufacturer suggested pressure. A bent or out-of-adjustment control linkage can also cause this issue; repair or replace the linkage. Finally, a sticking bypass assembly can be the cause; repair or replace the bypass.
E
Elizabeth WalkerAug 28, 2025
How to fix a Toro Lawn Mower transaxle oil leak?
- M
  Mrs. Patricia ShortAug 28, 2025
  If the transaxle on your Toro Lawn Mower is leaking oil, it could be due to damaged seals, housing, or gaskets; replace the damaged component. Air trapped in the hydraulic system can also cause leaks, so purge the hydraulic system.
A
Ann PerezSep 1, 2025
Why does my Toro Lawn Mower only operate in one direction?
- M
  Michael RodriguezSep 2, 2025
  If your Toro Lawn Mower operates in only one direction, it could be due to a bent or misaligned control linkage; repair or replace the linkage. Alternatively, the drive belt might be slipping, or the pulley could be damaged; repair or replace the drive belt or pulley.

Toro Lawn-Boy Precision Z320H Specifications

General

Transmission	Hydrostatic
Deck Type	Fabricated
Speed Range	0-7 mph
Deck Material	Steel
Cutting Height Range	1.5-4.5 in
Warranty	3 years limited

Summary

Safety Information

General Information

Explains the meaning of the warning symbol and the manual's scope.

Specifications

Hydrostatic Transaxles

Information and specifications for the Hydro-Gear EZT Hydrostatic Transaxles.

Torque Specifications

Recommended fastener torque values for inch and metric series bolts.

Hydro-Gear Transaxle

Transaxle Removal

Detailed steps for removing the Hydro-Gear transaxles from the unit.

Transaxle Installation

Steps for installing the Hydro-Gear transaxles back into the unit.

Purging Procedures - Hydro-Gear Transaxles

Steps to purge air from the hydrostatic system after service.

Neutral Adjustment

Procedure for adjusting the transaxle neutral position.

Brake Adjustment

Steps to adjust the transaxle brake system.

310-220 EZT Troubleshooting Checklist

Checklist for diagnosing common issues with the 310-220 EZT transaxle.

Electrical Systems

Electric (PTO) Clutch

Mower Decks

Leveling the Mower from Side-to-Side

Adjusting the Front-to-Rear Blade Slope

Inspecting the Belts

Replacing the Mower Belt

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