Slide Gate SL540GL parts

LiftMaster SL540GL slide gate operator replacement parts diagram

LiftMaster SL540GL Slide Gate Operator Parts

Genuine replacement parts for the LiftMaster SL540GL commercial slide gate operator. Use the exploded views above with the tables below to identify what you need, then click any part number to order. The upper drawing is the electrical box; the lower drawing is the operator.

Before you order — three things to check.

1. Your configuration code sets the motor, solenoid and overload. The SL540GL ships in four builds — SL540-33-11, SL540-33-21, SL540-50-11 and SL540-50-21. The number after the first dash is horsepower (33 = 1/3 HP, 50 = 1/2 HP) and the last pair is voltage (11 = 115V, 21 = 230V). Your code is on the operator's data label. Match it in the Variable Parts table; ordering the wrong voltage motor or the wrong amp overload is the most common mistake on this unit.

2. The SL540 and SL570 share this drawing but not every part. Bearing plates, idler sprockets, pulleys, the drive chain and the output shaft kit are model-specific. Everything listed on this page is the SL540 part. If you have an SL570, use the SL570GL parts page instead.

3. Two different S-numbers appear on this operator. On the electrical box drawing, S1–S5 are limit switch parts. On the operator drawing, S1–S10 are intermediate shaft parts. They are separate assemblies — check which drawing your callout came from before ordering.

Part numbers shown as plain text rather than links are no longer available from the manufacturer. They are listed so you can identify what you have.

Common SL540GL Repairs

Symptom	Usual cause	Parts to check
Gate runs then stops short, or overload trips	Overload sized wrong or worn	Overload (see Variable Parts), G038024K contactor
Gate coasts past the stop point	Brake not engaging	Brake Kit K71-18630 / K71-18631, K22-120 or 22-240 solenoid
Limits drift or will not hold	Limit nut or hall sensor worn	K13-10024, K74-18379, K29-18163
Motor hums but gate does not move	Belt slipping or clutch worn	V-Belt 4L300 (S9), Clutch Facing (S8), Clutch Spring Kit (S10)
Chain jumps or rattles under load	Drive chain, idler sprocket or shield worn	G193020 #40 chain, Chain Drive Kit K75-18627, MG4100933 shield
Gate will not release by hand	Disconnect assembly seized	Disconnect Plate Kit (O8), Disconnect Spring Kit (O9), Disconnect Arm (O11)
No power, nothing responds	Board or fuse	K001A5566 GL PCB, 21-3260-1 fuse, K35-310-032-1

Operator Parts

Ref	Part #	Description
1	MG24740	Outer Cover Assembly Kit
3	MG4200913	Bearing Plate Assembly, Drive Side (SL540)
5	MG4200914	Bearing Plate Assembly, Pulley Side (SL540)
6	MG8230002	Thrust Washer
7	—	Motor — see Variable Parts below
8	MG3100374	Motor Pulley
9	10-G0546	Control Box Mounting Plate
10	MG4101349	Side Plate, Drive Side
11	MG4200843	Frame and Nutsert Assembly — no longer available
12	MG4100933	Chain and Sprocket Shield
13	MG4101051	Cover Stop
14	MG4200400	Cover Hinge
15	MG4100316	Side Plate, Pulley Side
16	10-G0571	End Channel (Qty 2)
17	MG4100932	Belt Shield — no longer available
18	76-G0537	Alarm Assembly (supplied as K76-G0537)
19	MG4100621	Mounting Angle (Qty 2)

Intermediate Shaft Assembly Kit — K72-18625

Sold as a complete kit. Individual components are listed for identification.

Ref	Part #	Description
S2	—	SL540 Intermediate Shaft Assembly
S3	—	Bearing, 5/8" Flange
S4	—	SL540 Pulley Assembly
S6	—	41B-9T Sprocket Kit
S7	—	Brake/Clutch Plate Kit
S8	—	Clutch Facing
S9	—	V-Belt, 4L300 Solid (SL540)
S10	—	Clutch Spring Kit

Output Shaft Assembly Kit — K72-18940

Ref	Part #	Description
O1	—	SL540 Output 41B-17T Sprocket Kit
O3	MG8210028	48B-11T Timer Sprocket Kit — no longer available
O4	—	Bushing
O5	MG49157	Output Shaft — no longer available
O6	—	41A-48T Sprocket Kit
O7	—	#41 Roller Chain Kit
O8	—	Disconnect Plate Kit
O9	—	Disconnect Spring Kit
O10	—	Output Shaft Clip Ring Kit
O11	—	Disconnect Arm Assembly

Brake Kit — K71-18630 (115V) / K71-18631 (230/460V)

Ref	Part #	Description
B1	—	Brake Link Kit
B2	—	Brake Puck and Lever Assembly
B3	—	Brake Lever
B4	—	5/8" Set Collar
B5	—	Brake/Clutch Plate Kit

Chain Drive Kit — K75-18627

Ref	Part #	Description
C1	—	Idler Shaft and Clip Kit
C3	—	SL540 41B-15T Idler Sprocket Kit
C4	—	Idler Shaft Kit

Control Box — Limit Shaft Assembly Kit K72-18628

Ref	Part #	Description
L1	—	Limit Chain Kit
L2	MG4200350	Limit Plate and Bearing Assembly
L3	K13-10024	Limit Nuts
L4	K29-18163	16 Pole Magnet
L5	—	40B-11T Timer Sprocket
L6	—	Limit Shaft Assembly
L7	MG4100977	Limit Support Bracket — no longer available
L8	10-G0470	Limit Assembly End Plate
L9	10-G0483	Hall Sensor Mounting Bracket
L10	K74-18379	Hall Effect Sensor Assembly
L11	—	Flange Bearing in Limit Assembly

Control Box — Limit Switch Assembly Kit K74-18629

Ref	Part #	Description
S1	MG4100966	Limit Detent — kit only, no longer available separately
S2	MG4100967	Limit Detent Spring — no longer available
S3	K23-10041	Limit Switch
S4	MG4200349	Limit Switch Assembly Kit — no longer available
S5	—	Limit Switch Bracket Assembly

Control Box — Electrical Box Components

A complete electrical box kit is ordered by adding a K prefix to your operator's model number — for example SL540-50-11 becomes K73SL540-50-11.

Ref	Part #	Description
1	K001A5566	GL PCB Assembly — no longer available
2	MG4101510	Brake Solenoid Link
4	22-575	575V Brake Solenoid
5	22-240	240V Brake Solenoid
6	22-120	120V Brake Solenoid (supplied as K22-120)
8	21-3260-1	Secondary Fuse
11	—	Overload — see Variable Parts below
16	G038024K	24V Contactor

Variable Parts — Match Your Configuration Code

Find your operator's code on its data label, then order the motor, solenoid and overload from the rows that list it.

Ref	Part #	Description / Used On
7	20-1033B-1L	Motor, 1PH 1/3 HP Base Mount 115V — SL540-33-11
7	20-1033B-9L	Motor, 1PH 1/3 HP Base Mount 230V — SL540-33-21
7	20-1050B-1L	Motor, 1PH 1/2 HP Base Mount 115V — SL540-50-11 (no longer available)
7	20-1050B-9L	Motor, 1PH 1/2 HP Base Mount 230V — SL540-50-21
—	22-120	Brake Solenoid 115V — all 115V units
—	22-240	Brake Solenoid 230V — all 230V 1PH units
11	25-2006	Overload, 6 Amp — SL540-33-21, SL540-50-21
11	25-2008	Overload, 8 Amp — SL540-33-11
11	25-2010	Overload, 10 Amp — SL540-50-11

Parts Not Shown

Ref	Part #	Description
—	G193020	Drive Chain, #40, 20 ft with master link (K19-3020) — no longer available
—	K35-310-032-1	Fuse Kit
—	25-4002-5	Overload, 2.5 Amp (supplied as 25-4002-5K)

Also see the SL540GL / SL570GL electrical box parts page, or the full LiftMaster gate operator parts catalog.