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Husqvarna CTH2138R - User Manual

Husqvarna CTH2138R
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English
584 21 93-27
Operator’s Manual
CTH2138R
Gasoline containing up to 10% ethanol (E10) is acceptable for use in this machine.
The use of any gasoline exceeding 10% ethanol (E10) will void the product warranty.
Please read the operator's manual carefully and make sure
you understand the instructions before using the machine.

Table of Contents

Questions and Answers

  • J
    johnsoncharlesJul 30, 2025
    Why my Husqvarna CTH2138R Lawn Mower will not start?
    • J
      Jeffrey ColemanJul 30, 2025
      There are several reasons why your Husqvarna Lawn Mower might not start. It could be due to: * being out of fuel (fill the fuel tank), * improper choking (refer to the “TO START ENGINE” section in the Operation section), * a flooded engine (wait several minutes before trying again), * a bad spark plug (replace it), * a dirty air filter (clean or replace it), * a dirty fuel filter (replace it), * water in the fuel (empty the fuel tank and carburetor, refill with fresh gasoline, and replace the fuel filter), * loose or damaged wiring (check all wiring). Other potential causes include a carburetor out of adjustment (see “To Adjust Carburetor” in the Service Adjustments section) or engine valves out of adjustment (contact an authorized service center/department).
  • I
    ingramcodyAug 4, 2025
    Why is my Husqvarna CTH2138R Lawn Mower hard to start?
    • B
      Barry SotoAug 4, 2025
      If your Husqvarna Lawn Mower is hard to start, it could be due to several reasons: * A dirty air filter (clean or replace it). * A bad spark plug (replace it). * A weak or dead battery (recharge or replace it). * A dirty fuel filter (replace it). * Stale or dirty fuel (empty the fuel tank and refill with fresh, clean gas). * Loose or damaged wiring (check all wiring). Other potential causes include a carburetor out of adjustment (see “To Adjust Carburetor” in Service Adjustments section) or engine valves out of adjustment (contact an authorized service center/department).
  • C
    cheyenneporterAug 14, 2025
    What to do if Husqvarna CTH2138R engine will not turn over?
    • J
      jjohnsonAug 14, 2025
      If the engine of your Husqvarna Lawn Mower will not turn over, make sure that: * The brake pedal is depressed (depress the brake pedal). * The attachment clutch is disengaged (disengage the attachment clutch). Also, check for a weak or dead battery (recharge or replace it), a blown fuse (replace the fuse), corroded battery terminals (clean the battery terminals), loose or damaged wiring (check all wiring), a faulty ignition switch (check/replace the ignition switch), or a faulty solenoid or starter (check/replace the solenoid or starter). For faulty operator presence switch(es), contact an authorized service center/department.
  • E
    Erin DickersonAug 19, 2025
    How to fix excessive vibration in Husqvarna Lawn Mower?
    • D
      Danielle HermanAug 19, 2025
      Excessive vibration in your Husqvarna Lawn Mower can be caused by: * A worn, bent, or loose blade (replace the blade or tighten the blade bolt). * A bent blade mandrel (replace the blade mandrel). * Loose or damaged parts (tighten loose parts or replace damaged parts).
  • H
    Heather LindseyAug 25, 2025
    What to do if Husqvarna CTH2138R Lawn Mower engine clicks but will not start?
    • J
      jeannejohnsonAug 25, 2025
      If your Husqvarna Lawn Mower engine clicks but doesn't start, the issue might be due to: * A weak or dead battery (recharge or replace it). * Corroded battery terminals (clean the battery terminals). * Loose or damaged wiring (check all wiring). * A faulty solenoid or starter (check/replace the solenoid or starter).
  • E
    eileen93Nov 8, 2025
    Why does my Husqvarna Lawn Mower have loss of power?
    • S
      Scott RodriguezNov 8, 2025
      If your Husqvarna Lawn Mower is experiencing a loss of power, consider the following: * You might be cutting too much grass or going too fast (raise the cutting height or reduce speed). * The throttle might be in the “CHOKE” position (adjust the throttle control). * There could be a build-up of grass, leaves, or trash under the mower (clean the underside of the mower housing). * The air filter could be dirty (clean or replace it). * The oil level might be low or the oil dirty (check the oil level or change the oil). * The spark plug could be faulty (clean, regap, or change the spark plug). Other potential causes include a dirty fuel filter (replace it), stale or dirty fuel (empty and refill the tank with fresh gas), water in the fuel (empty the fuel tank and carburetor, refi...

Summary

Safety Rules

Accidental Starting Prevention

Safety warning about disconnecting the spark plug wire before setup, transport, adjustments, or repairs.

Coasting Downhill Warning

Warning against coasting downhill in neutral to avoid losing control of the tractor.

Towing Attachment Guidelines

Slope Operation Safety

Specific safety rules and precautions for operating the tractor on slopes.

Child Safety and Operation

Safety warnings and recommendations regarding children and operating the mower.

Towing Equipment Safety

Gasoline Handling Safety

Safety precautions for handling gasoline to prevent injury or property damage.

Tractor Operation Guide

Hazard Symbol Definitions

Definitions of DANGER, WARNING, CAUTION, HOT SURFACES, and FIRE symbols.

Tractor Control Functions

Setting the Parking Brake

Stopping the Tractor and Blades

Procedures for stopping the mower blades and the tractor's ground drive.

Forward and Backward Movement

Adjusting Mower Cutting Height

Instructions on adjusting the mower deck to the desired cutting height.

Operating the Mower

How to engage and operate the mower blades safely.

Stopping Mower Blades

Reverse Operation System (ROS)

Explanation and usage of the Reverse Operation System.

Using the Reverse Operation System

Specific steps for operating the tractor in reverse with attachments engaged.

Operating on Hills Safely

Safety precautions and operating procedures for mowing on hills.

Preparing Tractor for Transport

Pre-Start Engine Checks

Pre-start checks including engine oil level and fuel.

Adding Gasoline

Starting the Engine

Detailed procedures for starting the tractor engine in various conditions.

Warm Weather Starting Procedure

Cold Weather Starting Procedure

Purging the Transmission

Procedure to purge trapped air from the transmission for proper operation.

Mowing Tips

Practical advice and tips for effective and safe mowing.

Mulching Mowing Tips

Tips for optimal mulching performance, including blade speed and height adjustment.

Tractor Maintenance Schedule

Comprehensive Maintenance Schedule

A comprehensive schedule for performing regular maintenance tasks.

Lubrication Chart

Pre-Use Maintenance Checks

Essential checks to perform before each use of the tractor.

Brake System Check and Adjustment

Operator Presence & ROS System Checks

Checking the functionality of safety systems like OPS and ROS.

Mower Blade Maintenance

Guidelines for maintaining mower blades, including removal and installation.

6-Star Blade Handling

Cleaning Battery Terminals

Engine Lubrication Guidelines

Guidance on engine oil type, viscosity, and change intervals.

Changing Engine Oil

Step-by-step instructions for changing the engine oil.

Air Filter Maintenance

Spark Plug Replacement

In-Line Fuel Filter Replacement

General Tractor Cleaning

Using Deck Washout Port

Procedure for using the deck washout port to clean the mower deck.

Service and Adjustments

Critical Safety Warnings for Service

Critical safety warnings before performing any service or adjustments.

Leveling the Mower Deck

Instructions on how to level the mower deck for optimal cutting.

Visual Side-to-Side Deck Adjustment

Precision Side-to-Side Deck Adjustment

Front-to-Back Deck Pitch Adjustment

Adjusting the mower deck for proper front-to-back pitch.

Replacing Mower Blade Drive Belt

Instructions for removing and installing the mower blade drive belt.

Replacing Motion Drive Belt

Instructions for removing and installing the motion drive belt.

Checking Brake System Performance

Jump-Starting with Weak Battery

Procedure for jump-starting the tractor with a weak battery.

Replacing the Tractor Battery

Detailed instructions for removing and replacing the tractor battery.

Tractor Storage Procedures

Preparing Tractor for Storage

Engine Storage Preparation

Procedures for preparing the engine for long-term storage.

Fuel System Storage Precautions

Important steps to prevent gum deposits in the fuel system during storage.

Engine Oil for Storage

Troubleshooting Common Issues

Engine Will Not Start

Common causes and corrections for an engine that will not start.

Engine Hard to Start

Potential causes and solutions for difficulty starting the engine.

Engine Will Not Turn Over

Reasons why the engine might not crank and how to fix them.

Engine Clicks, Wont Start

Loss of Engine Power

Excessive Vibration Issues

Engine Runs After Operator Leaves Seat

Troubleshooting faulty operator-safety presence control system.

Uneven or Poor Lawn Cut

Mower Blades Not Rotating

Poor Grass Discharge

Battery Not Charging

Loss of Tractor Drive

Engine Backfiring on Shutdown

Engine Dies When Shifting to Reverse

Troubleshooting the engine dying when shifting into reverse.

Mower Not Operating Correctly

Checking for correct installation of bagger or deflector.

Slope Operation Guide

Measuring Hill Slopes

Instructions on how to use the provided guide to measure hill slopes.

Husqvarna CTH2138R Specifications

General IconGeneral
Cutting Width38 inches
Cutting Height1.5 - 4 inches
Deck MaterialSteel
EngineBriggs & Stratton
Warranty3 years

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