TDC Maxum Trolley Operator Parts
LiftMaster Maxum TDC Trolley Operator Replacement Parts
Genuine LiftMaster replacement parts for the Maxum TDC industrial DC trolley operator. Find your part number in the tables below and click it to go straight to that item.
Before you order. The TDC shares its control platform with the jackshaft and hoist Maxums — same main board, same EMI boards, same transformers — but the drive train and everything below the operator head is TDC-only.
Chain pitch is set by door weight, not by preference. The TDC 700 runs a #48 chain output; the TDC 1200 and TDC 2200 run #41. Ordering across pitches will not fit.
Disconnect: the TDC uses a quick-disconnect door arm for manual door movement — it has no hoist chain and no sash-chain release. If your operator has either of those, you are on the wrong page: see JDC, RJDC & JHDC Jackshaft and Hoist Parts.
Models Covered
TDC 700 lb: TDC7S1BMC, TDC7S4BMC.
TDC 1200 lb: TDC12S1BMC, TDC12S4BMC, TDC12X1BMC, TDC12X4BMC.
TDC 2200 lb: TDC22X1BMC, TDC22X4BMC.
How to read your model number: T = trolley, then DC, then the door weight (7 = 700 lb, 12 = 1200 lb, 22 = 2200 lb), then the duty cycle (S = standard 20 cycles/hour, X = extended or continuous duty), then the voltage (1 = 120/240V single or three phase, 4 = 480V three phase), then B for battery-backup capable. MC carries no significance. Sprockets, frames, motors and chains all vary by weight and duty letter, so read the full number off the operator's label before ordering.
Trolley, Rail and Door Arm Assembly
Reference numbers match the assembly view above.
| Ref | Part # | Description |
|---|---|---|
| 18 | K75-10170 | Trolley (listed in our catalog as Slider Assembly) |
| 19 | K75-10174 | Front Idler Assembly |
| 20 | K75-10259 | Tracker Spacer |
| 21 | K10-10205 | Header Bracket |
| 22 | K41-0565-000 | Header Pivot Pin |
| 24 | — | Door Track — call for pricing and availability |
| 25 | 10-10011M1 | Frame (listed in our catalog as Drawbar Frame) |
| 27 | K11-10197 | Take Up Bolt, 3/8 in. x 4 in. |
| 28 | K75-17034 | Heavy Duty Straight Arm |
| K5 | K75-12870 | Door Arm Kit — complete with curved arm, straight arm, door bracket and hardware |
TDC Service Kits — Sprockets, Frames and Motor Cap
Drive sprockets are matched to the chain pitch. The 16-tooth #41 sprocket is standard fitment on the TDC22 and is also the part used to slow a TDC12 by about 20%.
| Part # | Description |
|---|---|
| K41-0373-000 | 20-Tooth Drive Sprocket, #48 — TDC7 |
| K41-0372-000 | 20-Tooth Drive Sprocket, #41 — TDC12 |
| K41-0564-000 | 16-Tooth Drive Sprocket, #41 — TDC12/TDC22 |
| K41-0552-000 | Operator Frame — TDC 700 & 1200 |
| K41-0482-000 | Frame — TDC 2200 |
| K41-0562-000 | Motor Cap — TDC 2200 |
Door Drive Chain Kits
Chain kits are cut to door height. Measure your door before ordering, and confirm the pitch: #48 for the TDC 700, #41 for the TDC 1200 and 2200.
#48 chain — TDC 700
| Part # | Description |
|---|---|
| TDC48-08 | #48 Chain for TDC 700 — doors to 8 ft |
| TDC48-10 | #48 Chain for TDC 700 — doors to 10 ft |
| TDC48-12 | #48 Chain for TDC 700 — doors to 12 ft |
| TDC48-14 | #48 Chain for TDC 700 — doors to 14 ft |
| TDC48-16 | #48 Chain for TDC 700 — doors to 16 ft |
| TDC48-18 | #48 Chain for TDC 700 — doors to 18 ft |
| TDC48-20 | Doors to 20 ft — LiftMaster prints this one as "#41 Chain (3/4 & 1 HP)". Call to confirm pitch before ordering. |
#41 chain — TDC 1200 and TDC 2200
| Part # | Description |
|---|---|
| TDC41-10 | #41 Chain for TDC 1200 and 2200 — doors to 10 ft |
| TDC41-12 | #41 Chain for TDC 1200 and 2200 — doors to 12 ft |
| TDC41-14 | #41 Chain for TDC 1200 and 2200 — doors to 14 ft |
| TDC41-16 | #41 Chain for TDC 1200 and 2200 — doors to 16 ft |
| TDC41-18 | #41 Chain for TDC 1200 and 2200 — doors to 18 ft |
| TDC41-20 | #41 Chain for TDC 1200 and 2200 — doors to 20 ft |
| TDC41-24 | #41 Chain for TDC 1200 and 2200 — doors to 24 ft |
Motor, Gear Box & Encoder Assemblies
The motor's part number is printed on the motor's own data label — if you can reach it, read the number off the label and match it below; that is the most reliable way to order the right motor.
| Part # | Description |
|---|---|
| K41-0377-000 | Motor, Gear Box & Encoder — TDC7S |
| K41-0378-000 | Motor, Gear Box & Encoder — TDC12S |
| K41-0410-000 | Motor, Gear Box & Encoder — TDC12X |
| K41-0379-000 | Motor, Gear Box & Encoder — TDC22X |
Motors, Brushes & Encoder
Service-level motor parts, for when the gearbox is sound and only the motor or its wear items need replacing. The brush kit fits the extended and continuous duty "X" models.
| Part # | Description |
|---|---|
| K41-0424-000 | Motor with Endcap — JDC, RJDC, JHDC, TDC 700 standard duty |
| K41-0425-000 | Motor with Endcap — JHDC, TDC 1200 standard duty |
| K41-0426-000 | Motor with Endcap — JHDC, TDC 1200 extended/continuous duty |
| K41-0427-000 | Motor with Endcap — JHDC, TDC 2200 extended/continuous duty |
| K41-0413-000 | Motor Brushes (4) — extended/continuous duty X models |
| K41-0469-000 | Motor Cap only — RJDC7, JDC7 and TDC7/12/22 |
| K41-0387-000 | Encoder, with drive sprocket, snap ring, mounting plate and screws |
Control Box & Electronics
The main board is common to every Maxum operator. The EMI board is not — there is a 480VAC board and a separate 120/240VAC board, and fitting the wrong one is the most common ordering mistake on this platform. Check the voltage digit in your model number (1 = 120/240V, 4 = 480V) before you order.
| Part # | Description |
|---|---|
| K41-0388-000MC | Main Board — all Maxum operators |
| K41-0390-000 | EMI Board — all Maxum operators, 480VAC |
| K41-0391-000 | EMI Board — all Maxum operators, 120/240VAC |
| K41-0395-000 | Control Box with Cover (front, back and hardware) |
| K41-0380-000 | Bridge Rectifier — 700 and 1200 |
| K41-0478-000 | Bridge Rectifier — 2200 |
| K77-36541 | Antenna |
Toroidal Transformers & Covers
Transformers are sized to the door weight and the supply voltage — six combinations, all different parts. Match both before ordering.
| Part # | Description |
|---|---|
| K41-0381-000 | Toroidal Transformer — 700, 120VAC-240VAC |
| K41-0382-000 | Toroidal Transformer — 700, 480VAC |
| K41-0383-000 | Toroidal Transformer — 1200, 120VAC-240VAC |
| K41-0384-000 | Toroidal Transformer — 1200, 480VAC |
| K41-0385-000 | Toroidal Transformer — 2200, 120VAC-240VAC |
| K41-0386-000 | Toroidal Transformer — 2200, 480VAC |
| K41-0428-000 | Transformer Cover — T, J, RJ and JH, 700 & 1200 |
| K41-0429-000 | Transformer Cover — TDC22 and JHDC22 |
2200 lb Models Only
The TDC 2200 adds an electromechanical holding brake on top of the dynamic braking fitted to every Maxum. The 700 and 1200 do not use this kit.
| Part # | Description |
|---|---|
| K41-0476-000 | Service Kit, Brake only — 2200 models |
Common TDC Faults
| Symptom | Likely part |
|---|---|
| Door binds or judders along the rail | Trolley K75-10170, front idler K75-10174, tracker spacer K75-10259 |
| Chain slack, chain jumping the sprocket | Take up bolt K11-10197, drive sprocket for your pitch, chain kit for your door height |
| Door arm bent or disconnect will not re-latch | Door arm kit K75-12870, heavy duty straight arm K75-17034 |
| Operator pulls away from the header, rail sags | Header bracket K10-10205, header pivot pin K41-0565-000 |
| Door runs to the wrong position or limits drift | Encoder K41-0387-000, or the full motor/gearbox/encoder assembly |
| No response at all, no display on the wall controller | Toroidal transformer for your weight and voltage, or bridge rectifier |
| Operator dead after a lightning event or line surge | EMI board — K41-0390-000 (480VAC) or K41-0391-000 (120/240VAC) |
| Motor runs weak, sparks, or smells hot on an X model | Motor brushes K41-0413-000 |
| TDC 2200 door drifts down when stopped | Brake service kit K41-0476-000 |
Related
JDC, RJDC & JHDC Maxum Jackshaft and Hoist Parts · Maxum DC Operator Accessories & Kits · Complete Maxum DC Operators
Not sure which part you need? Have your full model number, serial number and door height ready and give us a call — we work on these units every day.