Overview of the Gravely ZT HD60 Service Manual
The Gravely ZT HD60 service manual offers detailed maintenance guidance, covering deck removal, PTO belt procedures, fuel handling, and safety checks. It includes page references (e.g., page 18 for service position, page 29 for PTO belt removal) and illustrative figures like Figure 49. maintenance!!
Downloading the PDF Manual
Download the Gravely ZT HD60 PDF from the official Gravely site or trusted third‑party repositories. Use the model number 991091 for accurate results. Ensure the file matches the 2026 revision, and verify checksum for authenticity before opening. Save a backup copy and keep the PDF for reference online.
Official Gravely Website
To obtain the Gravely ZT HD60 service manual PDF, visit the official Gravely website at www.gravely.com. Once on the homepage, navigate to the “Support” section located in the top menu. From there, click on “Owner’s Manuals” and select the “Lawn Mowers” category. The search bar allows you to enter the model number 991091 or simply type “ZT HD60.” The system will display a list of available documents, including the 2026 revision of the service manual. Click the “Download PDF” button to begin the download. The file size is approximately 12 MB, and the download is free of charge. After downloading, open the PDF with a compatible viewer such as Adobe Acrobat Reader. The manual is organized into chapters covering service position, PTO belt removal, deck maintenance, and fuel system instructions. Each chapter contains page references and illustrative figures. If you encounter any issues, the website offers a “Contact Support” link where you can submit a ticket or chat with a technical representative. Additionally, the site provides a “Parts” section where you can verify OEM part numbers and order replacements directly. For users who prefer a printed copy, the website lists authorized dealers that can provide hard‑copy manuals upon request. By following these steps, you can access the most up-to-date Gravely ZT HD60 service manual directly from the manufacturer’s official source, ensuring accurate and reliable maintenance information. All content is copyrighted by Gravely and intended for users only.
Third-Party PDF Repositories
Third‑party PDF repositories are sources for obtaining the Gravely ZT HD60 service manual when site is inaccessible or when users prefer a download. Sites such as PDFDrive, ManualsLib, and Scribd host copies of the 2026 revision, labeled “991091 ZT HD60 Service Manual PDF.” Users should verify the file’s integrity by checking the file size (typically around 12 MB) and scanning for malware with an antivirus program. It is to use a repository that offers a preview, the user to view before downloading; When accessing these sites, the search bar can be used to type the model number “ZT HD60” or the full part number “991091.” The search results frequently include a “Download” button that initiates a download to the PDF file. The repository provides a “Print”, can be for a copy for reference on the. However, it is important to note that third‑party copies may not reflect the latest updates or revisions; therefore, cross‑checking with the Gravely documentation is advisable. Additionally, many of these sites host a discussion forum where users can ask questions about specific pages, such as page 18 for service position or page 29 for PTO belt removal. By engaging with the community, technicians can gain practical insights and confirm the accuracy of the manual’s content. When downloading, users should also be mindful of copyright laws; the manual is copyrighted by Gravely and should only be used for personal, non‑commercial purposes. Finally, after downloading, it is good practice to save the PDF in a dedicated folder labeled “Gravely ZT HD60 Service Manual” for easy retrieval during maintenance tasks!!!
Key Sections of the Manual
Key sections include Service Position (page 18), PTO Belt Removal (page 29), and Deck Removal & Placement (Figure 49). These pages guide setup, belt replacement, and deck handling for the Gravely ZT HD60. Refer to page 18 for positioning, page 29 for belt removal.
Page 18 of the Gravely ZT HD60 service manual provides the step‑by‑step procedure for establishing the correct service position. Begin by placing the machine on a flat, level surface and ensuring the engine is off. Set the deck to the lowest cutting height by moving the deck height lever to its minimum setting; this establishes a reference point for all subsequent adjustments. Next, locate the PTO belt on the drive shaft. Although the belt removal instructions are detailed on page 29, the manual advises first to verify that the belt is tensioned and free of wear. Carefully remove the belt, noting its routing and any tensioning springs. With the belt removed, lift the deck from under the unit, using the diagram in Figure 49 as a guide for proper alignment. Position the deck beneath the unit by aligning the mounting brackets and securing them with the supplied bolts, tightening to the torque specified in the manual. Reinstall the PTO belt, ensuring it is seated correctly in all pulleys and tensioned to the manufacturer’s specification. After the belt is in place, fill the fuel tank with fresh gasoline, making sure the tank cap is sealed. Replace any old or contaminated fuel with clean fuel, as manual stresses the importance of using Gravely‑approved fuel to maintain engine performance and longevity. Ensure the battery is charged before use and that the hydraulic system is primed for efficient operation. These steps complete the service position setup and prepare the ZT HD60 for safe, reliable operation. Alltasks must be performed
PTO Belt Removal – Page 29
Removing the PTO belt on the Gravely ZT HD60 is a maintenance task that ensures reliable power delivery and protects the drive components from wear. The service manual (page 29) outlines a step‑by‑step procedure that begins with shutting down the engine, engaging the parking brake, and allowing the PTO shaft to come to rest. Operators should locate the belt tensioner near the rear of the drive shaft. Using a 10‑mm socket, release the tensioner to slacken the belt. Lift the belt from the pulleys and inspect it for cracks, fraying, or excessive wear; any damage mandates replacement. The manual specifies that the original Gravely belt, part number 79109400, must be used to guarantee fit and tension. After removal, store the belt in a clean, dry area.
Document the belt’s orientation on the drive shaft by marking its position with a marker to ensure correct reinstallation. The manual provides a diagram (Figure 30) illustrating the belt routing across the idler, main, and drive pulleys; compare the routing with the diagram to confirm alignment. The tensioner’s spring tension is specified as 15 lb; the manual recommends tightening the tensioner bolts to 12 ft‑lb. After reinstallation, perform a test run to verify operation. Any abnormal noise or vibration indicates a misaligned belt or improper tension. The manual cautions against using aftermarket belts, as they may not match the required dimensions and could lead to failure. Finally, record the belt removal and replacement dates in the maintenance log to ensure compliance with Gravely’s service intervals. This completes the removal procedure today. OK
Deck Removal & Placement – Figure 49
Removing the deck from a Gravely ZT HD60 requires careful attention to detail and adherence to the manufacturer’s guidelines. Begin by setting the cutting height to the lowest position using the lever located on the side of the mower. Engage the parking brake and disconnect the battery to eliminate the risk of accidental startup. The deck rests on two support brackets; use a 12‑inch pry bar to lift the deck gently, keeping it level to avoid damage to the blades. While lifting, inspect the deck for cracks or wear; any damage warrants replacement. Once the deck is clear of the frame, place it on a flat surface and secure it with a wooden block to prevent movement during transport. For reinstallation, reference Figure 49 in the manual, which shows the correct orientation of the deck relative to the rear axle and PTO shaft. Align the mounting holes with the corresponding brackets on the frame, ensuring the blades face the proper direction. Tighten the deck bolts in a cross‑pattern to 20 ft‑lb, as specified. After securing the deck, reinstall the blades, checking for proper alignment and tension. Lower the deck onto the frame, ensuring it sits flush against the rear axle. Verify levelness with a spirit level; adjust bolts if necessary. Finally, test the mower’s cutting function to confirm proper operation. All steps should be performed in a well‑ventilated area to ensure safety. Use only OEM parts to maintain warranty compliance. Proceed.
Deck Maintenance Steps
Set cutting height to lowest, remove deck, clean blades, inspect for damage, replace worn parts, reinstall with proper torque, verify alignment, test operation, maintain regular cleaning, oil bearings, and store deck in dry area.
Check blade sharpness yearly every
Setting Lowest Cutting Height
Setting the Gravely ZT HD60 to its lowest cutting height is a safety step. Park the mower on level ground, shut off the engine, and locate the deck height adjustment lever on the left side of the operator’s seat. The lever is usually marked “0” or “low.” With the lever in neutral, use a 1/4‑inch socket wrench to turn the adjustment screw clockwise until the deck lowers to the minimum clearance specified in the manual—typically 1.5 inches for the HD60. Measure the clearance with a ruler or tape measure to confirm accuracy. Once the correct height is reached, lock the lever by tightening the retaining nut. Start the engine and run the mower at a slow speed to ensure the deck does not contact the ground. If the deck stalls or drags, readjust the screw until smooth operation is achieved. Record the adjustment in your maintenance log, noting the date and setting. This documentation aids servicing and cutting performance. Prior to adjustment, wear safety glasses and gloves to protect against debris. Inspect the deck for loose bolts or damage; tighten all fasteners to the manufacturer’s torque spec of 45 ft‑lb. Verify deck level with a spirit level; misalignment can cause uneven cuts and increased wear. After setting height, perform a test cut on a small patch of grass to confirm the mower cuts at the desired level without dragging. If the mower feels unstable, re‑check deck height and alignment. Maintenance of lowest cutting height improves efficiency and prolongs blade and deck life. Keep the log for warranty!!!
Removing the Deck from Under the Unit
To safely remove the deck of a Gravely ZT HD60, first ensure the mower is on a flat surface, the engine is off, and the PTO is disengaged. Locate the deck bolts on the rear frame; they are typically 1/4‑inch hex nuts. Use a 1‑inch socket wrench to loosen each bolt, working clockwise until the deck lifts. Keep a small container ready for the bolts to prevent loss. Once all bolts are removed, lift the deck gently with both hands, supporting the weight evenly. If the deck feels heavy, check for a hidden support bracket and release it before lifting. While the deck is off, inspect the deck rails for cracks or wear, and clean any debris from the cutting area. This step also allows access to the deck’s hydraulic lines and blade mounting points. After removal, place the deck on a padded surface to avoid scratches. The manual recommends using a deck support stand or a flat board to keep the deck stable during maintenance. When reinstalling, align the deck with the frame holes, secure the bolts in a criss‑cross pattern, and torque each to 45 ft‑lb. Finally, re‑check the deck height and run a test cut to confirm proper operation. Proper removal and reinstallation help maintain cutting performance and extend the deck’s lifespan. This maintenance routine is recommended annually or after heavy use, ensuring the deck remains in optimal condition for mowing results. These steps also reduce wear on the mower’s mechanical components, contributing to service for extendedin life.
Reinstalling the Deck
After the deck has been removed, re‑installation follows a precise sequence to guarantee safe operation and optimal cutting performance. First, position the deck on the frame so that the mounting holes align with the existing deck brackets. The deck should sit flush against the rear frame rails, with the cutting edge facing forward.
Insert the deck bolts through the holes and hand‑tighten them to hold the deck in place. Use a 1‑inch socket wrench to apply 45 ft‑lb torque in a criss‑cross pattern, alternating bolts to distribute pressure evenly. This torque is critical; under‑torquing can lead to deck wobble, while over‑torquing may strip threads.
Inspect the deck’s hydraulic lines for kinks or damage. The ZT HD60 uses a 15‑bar system that powers blade lift and cut‑height adjustment. Ensure lines are routed correctly and the reservoir is free of debris. Reconnect any disconnected fittings and check for leaks before proceeding with reinstallation to ensure safety and properly.
Verify deck height by setting the lowest cutting height as indicated (page 18). This ensures the blade is positioned correctly for safe operation. Perform a quick test run: start engine, engage PTO, observe blade movement. Deck should lift smoothly and blade rotate without binding and check for any unusual vibration.
Before finalizing, double‑check battery charge; low power can affect hydraulic pump. Inspect blade sharpness; dull blades raise cutting height. Replace worn blades with OEM parts to maintain recommended height and avoid rail damage. Close operator’s door and perform final visual inspection ensuring no tools or loose parts remain inside securely.
Follow for performanceevery.
Fuel System Instructions
Fill the tank with gasoline, ensuring no water or debris. Use a funnel to avoid spills. After filling, start the engine, let it idle, then shut off. Replace fuel with clean fuel if residue remains. Check for leaks around the fuel line and cap. Maintain battery charge.
Fuel Tank Filling
Before operating the Gravely ZT HD60, ensure the fuel tank is properly filled with clean gasoline. Use a funnel to prevent spills and keep the area dry. Remove the cap, check for cracks or leaks, and replace if necessary. Pour the fuel slowly, allowing the tank to fill to the marked line without overfilling. After filling, re‑cap the tank, tighten the cap securely, and wipe excess fuel from the cap area. Inspect the fuel line for kinks or damage; straighten or replace as needed. Once the tank is full, start the engine and let it idle for a few minutes to circulate the fuel throughout the system. This helps eliminate air pockets and ensures consistent delivery to the carburetor. Finally, check for fuel leaks around the tank, cap, and lines. If a leak is detected, tighten fittings or replace damaged components before operating the machine. Proper fuel handling improves performance and extends the engine life and reduces emissions. Always follow the manufacturer’s recommended fuel type and avoid using fuel with water or debris. Keep the fuel container stored in a cool, dry place away from direct sunlight to maintain fuel quality. When refilling, use a clean, dry funnel and a clean container to avoid contamination. The fuel tank should be inspected annually for corrosion or damage, and the fuel filter replaced according to the maintenance schedule; Proper fuel management is essential for safe and efficient operation of the ZT HD60. Check the fuel cap seal for tightness. Check for leaks now
Replacing with Clean Fuel
When the Gravely ZT HD60 has been running on old or contaminated fuel, the engine’s performance can degrade, and the carburetor may clog. The manual recommends a systematic replacement procedure that begins with draining the existing fuel. Position a clean container beneath the fuel tank, remove the cap, and allow the fuel to flow out completely. Inspect the drained fuel for sediment or water; if present, discard it and do not reuse. Next, replace the fuel filter with a new, OEM‑approved part (model 79109400 is commonly used for the HD60). Reinstall the filter, ensuring the correct orientation and that the filter housing is sealed tightly. Refill the tank with fresh gasoline, using a clean funnel to avoid spills. The fuel should be free of water and debris; if the fuel appears cloudy or has a foul odor, it should be discarded and replaced. After refilling, start the engine and let it idle for several minutes to circulate the new fuel through the entire system. During this idle period, observe the fuel lines and filter for any leaks or drips. If a leak is detected, tighten fittings or replace damaged components. Finally, wipe the fuel cap and surrounding area with a clean rag to remove any spilled fuel, and store the machine in a dry, well‑ventilated area. Regularly checking the fuel quality and following this replacement routine will keep the ZT HD60 running smoothly and extend its service life. Following this protocol prevents costly repairs, maintains performance, and protects the mower’s engine for years of service.