JDC, RJDC, JHDC Maxum Jackshaft & Hoist Parts

LiftMaster Maxum JDC, RJDC & JHDC Replacement Parts

Genuine LiftMaster service kits for the Maxum DC jackshaft and hoist operators. Find the K number on the drawing, then click the part number in the table.

JDC — jackshaft, no hoist or release. Battery backup included.

RJDC — jackshaft with a floor-level manual release sash chain. Left-hand (RJDC7S1BEL, RJDC7S4BEL) or right-hand (RJDC7S1BER, RJDC7S4BER); handing is not field-changeable.

JHDC — jackshaft with a hoist (red/green ropes and hand chain). 700, 1200 and 2200 lb.

RJDC owners: your motor is K41-0539-000, frame K41-0541-000, release K41-0542-000 and output sprocket K41-0566-000. Board, EMI board, control box, rectifier, 700 lb transformer and encoder are shared with the JDC.

Trolley models: TDC Maxum Trolley Operator Parts.

Model numbers covered: JDC7S1BMC, JDC7S4BMC, JDC7S1BE, JDC7S4BE, RJDC7S1BEL, RJDC7S1BER, RJDC7S4BEL, RJDC7S4BER, JHDC7S1BMC, JHDC7S4BMC, JHDC7S1BE, JHDC7S4BE, JHDC12S1BMC, JHDC12S4BMC, JHDC12X1BMC, JHDC12X4BMC, JHDC12S1BE, JHDC12S4BE, JHDC12X1BE, JHDC12X4BE, JHDC22X1BMC, JHDC22X4BMC. Read the weight (7/12/22), duty (S/X), voltage (1 = 120/240V, 4 = 480V) and E (3 in. shaft) off the label before ordering motors, frames or transformers.

Operator Head — Service Kit Locations

LiftMaster Maxum JDC RJDC JHDC jackshaft operator exploded parts diagram, service kits K1 to K14

Motor, Gear Box & Encoder (K1)

Ref Part # Description
K1 K41-0374-000 JDC/JHDC 700, non-3 in. shaft
K1 K41-0375-000 JHDC12S, non-3 in. shaft
K1 K41-0376-000 JHDC22X
K1 K41-0409-000 JHDC12X, non-3 in. shaft
K1 K41-0539-000 RJDC7
K1 K41-0540-000 JDC/JHDC 700, 3 in. shaft
K1 K41-0595-000 JHDC12S, 3 in. shaft call for pricing

Motors, Brushes & Encoder

Ref Part # Description
K1 K41-0413-000 Motor brushes (4), X models only
K1 K41-0424-000 Motor with endcap, 700 standard duty (JDC, RJDC, JHDC)
K1 K41-0425-000 Motor with endcap, JHDC 1200 standard duty
K1 K41-0426-000 Motor with endcap, JHDC 1200 extended duty
K1 K41-0427-000 Motor with endcap, JHDC 2200 extended duty
K1 K41-0469-000 Motor cap only (RJDC7, JDC7)
K12 K41-0387-000 Encoder with drive sprocket, snap ring, plate & screws

Control Box & Electronics

Ref Part # Description
K2 K41-0388-000MC Main board, all Maxum
K3 K41-0390-000 EMI board, 480VAC
K3 K41-0391-000 EMI board, 120/240VAC
K4 K41-0395-000 Control box with cover
K5 K41-0380-000 Bridge rectifier, 700/1200
K5 K41-0478-000 Bridge rectifier, 2200
— K77-36541 Antenna

Toroidal Transformers & Covers

Ref Part # Description
K6 K41-0381-000 700 lb, 120/240VAC
K6 K41-0382-000 700 lb, 480VAC
K6 K41-0383-000 1200 lb, 120/240VAC
K6 K41-0384-000 1200 lb, 480VAC
K6 K41-0385-000 2200 lb, 120/240VAC
K6 K41-0386-000 2200 lb, 480VAC
K9 K41-0428-000 Transformer cover, 700/1200 (J, RJ, JH) call for pricing
K9 K41-0429-000 Transformer cover, JHDC22 call for pricing

Frames & Operator Sprocket

Ref Part # Description
K7/K8 K41-0480-000 Operator frames L & R, JHDC 2200 call for pricing
K7/K8 K41-0541-000 Operator frame, RJDC7 call for pricing
K7/K8 K41-0551-000 Operator frame, JDC/JHDC7 & JHDC12 call for pricing
K10 K41-0566-000 12-tooth sprocket, #50 chain (JDC7, RJDC7, JHDC7/12)

RJDC Manual Release

Ref Part # Description
K13 K41-0542-000 Manual release subassembly, RJDC7 call for pricing
K13 K41-0548-000 Plastic cover only, manual release, RJDC7 call for pricing
K14 — Release sash chain — included with K41-0542-000

JHDC Hoist

Ref Part # Description
K11 K41-0479-000 Hoist assembly with red/green ropes (no chain), JHDC 700/1200/2200
— 1910929FT12 Hoist chain, 12 ft
— 1910929FT25 Hoist chain, 25 ft
— K41-0269-000 Engage/disengage ropes, 15 ft
— K41-0549-000 Engage/disengage ropes, 29 ft call for pricing

2200 lb Models Only

Ref Part # Description
— K41-0476-000 Brake service kit

Not sure which part you need? Send us the full model number from the operator label and we will confirm the correct kit before it ships.

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