Liftmaster CSL24U CSL24V CSL24VDC Gate Parts

LiftMaster CSL24U, CSL24UL, CSL24V and CSL24VDC commercial slide gate operator replacement parts diagram

LiftMaster CSL24U, CSL24UL, CSL24V & CSL24VDC Replacement Parts

Genuine LiftMaster replacement parts for the CSL24 family of commercial slide gate operators — the 1/2 HP, 24 VDC pad-mount slider with a timing-belt primary drive and a 10:1 gear reducer. Every generation shares the same motor, gear reducer, belt, sprocket, e-box and transformer; they differ only in the control board, expansion board, chassis and cover.

Which generation do I have? Open the e-box and read the main control board:

K1D8389-1CC → CSL24U / CSL24UL (current UL325 generation)
K1D8059-1CC → CSL24VDC
K1D6597-1CC → CSL24V / CSL24VH

Rows below marked with a model name apply only to that generation. Everything else fits all of them.

Covers split three ways. CSL24U takes K77-37852, CSL24UL takes K77-39426, and the CSL24V and CSL24VDC both take K77-37183. The complete cover kit for the CSL24U is K77-37856.

Chassis splits two ways: K73-34718-5 for CSL24U, CSL24UL and CSL24VDC; K73-34718-2 for CSL24V and CSL24VH.

Common CSL24 Repairs

Symptom	Usual cause	Parts to check
Motor runs but the gate does not move	Timing belt slipping, glazed or stripped	K16-GT2-7 timing belt, K17-36530 pulley kit
Gate runs on mains but dies in a power cut	Batteries at end of life	29-NP712 battery, K74-30762 pack, K94-37205 harness
Gate overruns or stops short	APS encoder not counting	K76-34697 APS encoder kit, K1A6408 APE kit
Gate will not reset after an obstruction	Reset switch or its ID resistor	K180A0357 reset switch, K94-36531 kit with resistor
Operator dead, no board lights	Transformer, EMI board or bridge rectifier	K204C0211 transformer, K76-34728 EMI board, K52C0481 rectifier
Grinding or heavy noise from the drive	Gear reducer or output sprocket worn	K32-34669-1 gear reducer, K15-41B17LKGH output sprocket
Belt jumping or chattering under load	Idler pulley worn	K75-50090 idler pulley
Chain slack or jumping at the gate	Drive chain stretched	19-41240D drive chain, 19-50307 master link

Gate Operator Repair & Service Parts

Ref	Part #	Description
1	K15-41B17LKGH	Output Sprocket
2	K32-34669-1	Gear Reducer, 10:1, #60
3	K16-GT2-7	Timing Belt
4	K1A6408	APE Kit, 24V
5	29-NP712	Battery, 12V, 7AH
6	K94-35152	Piezo Alarm
7	K1D8389-1CC	Main Board, DC Pad-Mounts, UL325 — CSL24U / CSL24UL / CSL24ULWK
7	K1D8059-1CC	Control Board — CSL24VDC
7	K1D6597-1CC	Control Board — CSL24V / CSL24VH
8	K1D8387-1CC	Expansion Board, UL325 — CSL24U / CSL24UL / CSL24ULWK
8	K1D8080-1CC	Expansion Board — CSL24VDC
8	K1D6686CC	Expansion Board — CSL24V / CSL24VH
9	K13-34729	E-Box Cover
10	K77-36541	Antenna
11	K76-34728	EMI Board with Power Switch
12	K180A0357	Reset Switch
13	K77-36542	E-Box
14	K73-34718-5	Chassis — CSL24U / CSL24UL / CSL24VDC
14	K73-34718-2	Chassis — CSL24V / CSL24VH
15	K204C0211	Transformer
16	K52C0481	Bridge Rectifier Kit
17	K75-50090	Idler Pulley, Q013
18	K76-36398	Motor, 1/2 HP, 24 VDC
19	K10-34758-2	Heater Battery Bracket
20	K77-37852	Cover, Gray — CSL24U
20	K77-39426	Cover, Gray — CSL24UL
20	K77-37183	Cover — CSL24V / CSL24VDC
21	K75-36260	Lock and Keys
22	K80-50295	Access Door Keys, Qty 2, Q118

Parts Not Shown in Diagram & Accessories

Ref	Part #	Description
—	K1D8389-1CCU	Upgrade Kit with Eyes, DC Pad, UL325
—	77-36764	Crank Bracket Kit
—	K07-50637	Chain Bolt, Q003
—	K94-34778	Board to Board Wire Harness, 24V — CSL24U
—	K94-36531	Reset Switch with ID Resistor Kit
—	K94-37205	Battery Harness, 7AH
—	K94-36250	Battery Wire Harness, 7AH — CSL24V / CSL24VDC
—	K94-36596	Battery Wire Harness, 33AH — CSL24V / CSL24VDC
—	K80-3001	Bolt, 5/16"-18 x 32
—	19-41240D	Drive Chain, #41, 10 ft
—	19-50307	Master Link, #41

Service Kits

Ref	Part #	Description
K1	K17-36530	Gear Reducer and Motor Pulley Kit
K2	K74-30762	Battery Pack, 12V, 7AH, Qty 2
K3	K76-34697	APS Encoder Kit, 24V
K4	K77-37856	Cover Kit, Gray — CSL24U
K4	LMWEKITU	Monitored Wireless Edge Kit