LiftMaster K75-34828 Idler Shaft Kit for Slide Gate Operators
The LiftMaster K75-34828 idler shaft kit is a mechanical replacement kit used in select LiftMaster slide gate operators. The idler shaft supports the chain path and helps keep the drive system aligned. If this assembly wears or bends, the gate may still move, but the drive chain can become noisy, loose, or unreliable.
This kit is most commonly listed for SL575 and SL585 slide gate operator families, and some references include SL595 plus GL, UL, and U variations. Because LiftMaster slide gate operators have been produced in multiple generations, the manual and parts diagram should be used to confirm fitment, especially on pre-2016, GL, UL, or industrial versions.
Common Replacement Reasons
- Drive chain jumps, walks, or comes off the sprocket
- Idler sprocket is worn, loose, or noisy
- Gate movement is rough or jerky under load
- Bearing wear or shaft play is visible
- Chain tension cannot be maintained correctly
Compatible With
Used with select LiftMaster slide gate operators. Confirm the exact model family, generation, and parts diagram.
- LiftMaster SL575 commercial slide gate operator series
- LiftMaster SL575GL slide gate operator references
- LiftMaster SL585 industrial slide gate operator series
- LiftMaster SL585GL slide gate operator references
- LiftMaster SL585UL slide gate operator references
- LiftMaster SL585U slide gate operator references
- LiftMaster SL595 extreme heavy industrial slide gate operator references where the parts diagram calls for this kit
- Select pre-2016 LiftMaster slide gate operator models in SL575, SL585, and SL595 families
Also Known As / Related Part Numbers
- K75-34828
- LM-K75-34828
- LiftMaster idler shaft kit
- SL575 idler shaft kit
- SL585 idler shaft kit
- SL595 idler shaft kit
- 50B12x1 sprocket reference in some kit listings
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Idler shaft replacement kit |
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| Part Number | K75-34828 |
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| Application | Slide gate operator drive chain support |
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| Compatible Operator Type | Commercial and industrial slide gate operators |
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| Common Models | SL575, SL585, SL595, GL, UL, and U versions where specified |
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| Common Components | Idler shaft, bearings, sprocket, and installation hardware depending on kit packaging |
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| Sprocket Reference | 50B12x1 in. referenced by some suppliers |
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| Notes | Verify generation and parts diagram before ordering |
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Technician Note
An idler shaft kit will not correct a gate that is dragging, out of level, or running with a damaged chain. Inspect the chain, drive sprocket, gate rollers, track, and guide rollers during the repair.
Before Ordering
- Confirm the operator model is in the SL575, SL585, or SL595 family where applicable
- Check whether the unit is GL, UL, U, or pre-2016 generation
- Compare sprocket size and shaft layout with the original assembly
- Inspect the drive chain and primary drive sprocket
- Correct gate track, roller, or guide problems before replacing the shaft
Professional Advisory
Slide gate mechanical repairs should be tested with the gate disconnected and reconnected according to the manual. A qualified gate technician should handle repairs where the gate is heavy, binding, or unsafe.
Product Questions
What does the K75-34828 idler shaft kit do?
It supports the slide gate operator drive chain and helps maintain proper chain alignment and tension.
Which LiftMaster operators commonly use this kit?
It is commonly listed for SL575 and SL585 series operators, with additional references to SL595 and GL, UL, or U versions where specified.
What parts may come in the kit?
Supplier listings commonly mention an idler shaft, bearings, sprocket, and installation hardware. Exact kit contents should be checked by supplier packaging.
Can this fix a chain that keeps coming off?
It can help if the problem is a worn idler shaft, sprocket, or bearing, but chain condition, gate alignment, track, rollers, and drive sprockets should also be checked.
Is this kit only for newer UL models?
No. It is referenced across several SL model generations, including pre-2016 and GL/UL/U listings, but exact fitment must be confirmed by parts diagram.
