LiftMaster K75-17997 Brake Kit Release Arm
The LiftMaster K75-17997 brake kit release arm is a service part used in the motor brake assembly area of select GH 5HP commercial door operators. It is part of the mechanical linkage that helps the brake release when the operator is placed into manual or service operation.
A release arm is not the same as a complete brake kit. It works with the brake release bracket, motor brake cover, bearings, friction components, solenoid, springs, and related hardware. If another part of the brake is seized, misadjusted, or worn, replacing only the arm may not restore proper brake operation.
The GH 5HP parts breakdown shows the brake motor release arm as part of the K75-18180 motor brake assembly kit area. This K75-17997 listing should be treated as the release arm service item for that GH 5HP brake assembly, with final fitment confirmed by parts diagram.
Compatible With
Use this release arm only in brake assemblies where the parts diagram or removed part confirms K75-17997 / 10-17997 style fitment.
- LiftMaster GH 5HP commercial door operators
- GH 5HP motor brake assembly service applications
- Select LiftMaster GH 5HP brake release linkage assemblies
- Commercial access applications using the matching GH 5HP brake release arm
Do not confuse this release arm with complete brake kits, brake solenoids, K75-10180 brake mounting plate, K75-10184 brake pressure plate, or release kits used on SD/GSD operators.
Also Known As / Related Part Numbers
The part number and nearby brake assembly references include:
- K75-17997
- 75-17997
- 7517997
- 10-17997 Brake Motor Release Arm
- K75-17997 Brake Kit Release Arm
- Related GH 5HP brake assembly reference: K75-18180 Motor Brake Assembly Kits
- Related component: 10-17996 Brake Release Bracket
- Related component: 10-18057 Motor Brake Cover
- Related component: 39-18086 Friction Disc Kit
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Brake release arm |
| Part Number | K75-17997 |
| Application | GH 5HP motor brake release linkage |
| Compatible Operator Type | GH 5HP commercial door operators |
| Related Brake Area | K75-18180 motor brake assembly kit section |
| Notes | Release arm only; not a complete brake assembly |
Technician Note
Brake release problems can be mechanical, electrical, or door-load related. Inspect the solenoid, release bracket, linkages, friction disc, springs, and manual hoist parts before assuming the release arm is the only failed part.
Before Ordering
- Match the exact part number on the operator parts diagram or the removed part whenever possible.
- Confirm the operator model, horsepower, voltage, phase, and production series before ordering.
- Check nearby brake, clutch, chain, shaft, and hardware components for wear so the new part is not damaged by another failed component.
- Do not substitute similar-looking commercial operator parts unless the LiftMaster parts breakdown confirms the same item number.
- Confirm whether the needed item is the release arm only or a complete brake kit.
- Check the brake solenoid voltage and brake hardware if the brake does not release electrically.
- Look for bent linkage, missing springs, or a dragging door that may have stressed the arm.
Professional Advisory
A commercial operator brake is a safety-critical assembly. Do not operate a heavy door with a brake that will not hold or release correctly. Use a qualified technician for brake diagnosis and final testing.
Product Questions & Answers
Is K75-17997 a complete brake kit?
No. It is a brake kit release arm / brake motor release arm reference, not a complete brake assembly.
What operator family is this commonly tied to?
It is commonly tied to LiftMaster GH 5HP commercial door operator brake assembly service parts.
Can a bad release arm cause manual release problems?
Yes. A bent, worn, or misaligned release arm can keep the brake from releasing correctly during manual operation.
Should I replace the solenoid at the same time?
Only if the solenoid is incorrect, failed, or called out by diagnosis. Match solenoid voltage and brake assembly parts by diagram.
What else should be inspected with this arm?
Inspect the brake release bracket, friction disc, springs, solenoid, linkage hardware, and hand chain release parts.
