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RY-SST44 Ryobi Trimmer - Overview

Diagrams for RY-SST44

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STRAIGHT SHAFT ASSEMBLY – Part Number: 308035047
$24.63
In Stock
STRAIGHT SHAFT ASSEMBLY
Part #308035047
Strange noise, strong shaking, or a cutting head that stops turning can point to a worn shaft assembly. The outer tube supports and protects the inner drive cable. Together, they carry power from the engine to the trimmer head. First remove grass and dirt from the head. Then check the clutch, drive cable, gear case, and connection points for damage. Use the complete tool model number to confirm the correct fit. Work only after the engine has cooled, and disconnect the spark plug wire. Keep track of all screws and clamps during removal. After the repair, check that the shaft is secure and the head spins without rubbing or binding.
String Head Assembly – Part Number: 309562007
No Longer Available
String Head Assembly
★★★★★
★★★★★
(2)
Part #309562007
This cutting head is for line trimmers. The cutting head attaches to the driveshaft and houses the cutting line. Wear work gloves to protect your hands when installing this part.
Hanger Cap – Part Number: 518019002
No Longer Available
Hanger Cap
Part #518019002
Trimmer String Head Adapter – Part Number: 678019002
No Longer Available
Trimmer String Head Adapter
★★★★★
★★★★★
(1)
Part #678019002
Genuine OEM replacement part, this part is sold individually. This part is where the stringhead assembly is mounted on the Trimmers shown below. It attaches to the spindle. The thread mount on the spindle is a left hand thread.
Gear Head – Part Number: 308210009
$32.02
In Stock
Gear Head
Part #308210009
This Gear gear head assembly is designed to transfer power from the drive shaft to the cutting head, allowing the string trimmer or brush cutter to operate smoothly and efficiently. Housed in a durable gearcase, it supports reliable rotation and helps maintain consistent cutting performance during use. Replacing a worn or damaged gear head can resolve issues such as loss of power to the cutting head, excessive noise, or erratic operation, restoring dependable performance. A properly functioning gear head also helps reduce strain on the drive system, contributing to longer service life and more efficient trimming results.
Wing Nut – Part Number: 660886001
$6.40
In Stock
Wing Nut
Part #660886001
This replacement wing screw is a genuine OEM sourced item, it is not an aftermarket imitation. It is specially designed for Homelite and Ryobi string trimmers and brush cutters. This hardware is generally used to secure the grass deflector. This screw is made from durable metal and it is sold individually.
Spool Retainer (Red-LH Thread) – Part Number: 308042003
$6.40
In Stock
Spool Retainer (Red-LH Thread)
Part #308042003
This is an OEM replacement part. It has a left hand threaded screw to remove and attach it to the trimmer head. Its purpose is to hold the spool with the cutting line, in the spool housing. It also acts as the bumper to advance the line from the spool. This is a well used and abused part of the trimmer. It may be a good idea to order an extra one.
Grass Deflector – Part Number: 308473001
No Longer Available
Grass Deflector
Part #308473001
String Guide – Part Number: 526939001
No Longer Available
String Guide
Part #526939001
Flanged Washer – Part Number: 678011002
No Longer Available
Flanged Washer
Part #678011002
This flanged washer is an OEM sourced replacement part that is made for Ryobi and Homelite handheld string trimmers. The washer has internal gears that allow it to engage with the gear head shaft and the string head adapter. Over time it may wear out, get damaged or lost eventually requiring a replacement to ensure your trimmer operates properly. It is a high-quality component which is made of a durable metal and is sold as an individual item. Check the owner's manual and the diagrams of your specific model to ensure the correct installation of the new flanged washer. Replacing it is a simple task that should not require any special tools. Remove the string head and the adapter and replace the old washer with the new one.
SPACER – Part Number: 518367001
$6.40
In Stock
SPACER
Part #518367001
This authentic OEM sourced part is specially made for use with Ryobi and Homelite handheld lawn and garden equipment. It is an identical replacement for a missing or a faulty spacer that was installed on a new unit. The purpose of this part is to separate two connected components and help ensure a tight seal, please make sure to refer to the appropriate diagrams of your model for the correct location and application of this hardware. Keep in mind this high-quality spacer is made of durable plastic and is sold individually.
Screw – Part Number: 660642001
$6.55
In Stock
Screw
Part #660642001
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Replaced straight shaft, and the gear head.
6 of 8 people found this instruction helpful.
  • Tim from HOLLISTER, CA
  • Really Easy
  • 30 - 60 mins
  • Socket set
Removed the 2 bolts holding the gear head to shaft. On my model I had to remove the complete trimmer head, then using 2 wrench take the trimmer head adapter off the gear heD. One video showed simply putting a screwdriver in the notch behind trimmer head and unscrewing complete head. Mine of course was slightly more involved but still qui te easy once I saw what needed to be done.
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