If you’re evaluating LiftMaster MAXUM for commercial use and need higher duty-cycle capability, sealed controls, and compact mounting options, here is a spec-driven comparison against GDI’s JDMG (jackshaft + low-profile trolley) and HAML (direct-drive high-cycle).
The values below are compiled from the PDFs/doc you provided for LiftMaster MAXUM and GDI cut sheets. Where a manufacturer lists a minimum or range, it is shown as-is.
| Category | LiftMaster MAXUM (trolley) | GDI JDMG (shaft drive + trolley mount) | GDI HAML (direct-drive high-cycle) |
|---|---|---|---|
| Duty cycle / cycles per day |
90–150 cycles/day Standard Duty: 90/day, Extended Duty: 150/day |
Up to 3,200 cycles/day High-cycle industrial applications |
Up to 5,000 cycles/day RBH/RCH/RDH/HR10 models listed at 5,000/day |
| Drive / mounting |
Trolley operator (MAXUM trolley configuration). Refer to LiftMaster drawings for mounting geometry. |
Jackshaft / shaft-driven systems (sprocket-to-sprocket capable) and trolley mount option. Designed for flexible field configuration. |
Direct drive gear-motor assembly for demanding applications. High torque and high duty capability. |
| Battery backup |
Minimum 20 cycles 24V DC battery backup, minimum 20 cycles (varies by door/load). |
50–200 cycles 36 VDC backup with intelligent charger and automatic switchover, cycle count varies by door weight. |
50–200 cycles 36 VDC backup with intelligent charger and automatic switchover, cycle count varies by door/load. |
| Operating temperature |
-40°C minimum (with heater) -40°C min with heater; -4°F min without heater noted in MAXUM specs. |
-40°C to +50°C No heater required to achieve -40°C rating (per GDI specs). |
-40°C to +50°C No heater required to achieve -40°C rating (per GDI specs). |
| Physical envelope / clearance notes |
Operator dimensions (body): 9.772 in W × 19.1–19.5 in H × 12.1 in D. Installation clearance depends on door geometry and mounting layout. |
Low-profile trolley clearance: 4.5 in Designed to minimize clearance requirements in tight headroom installations. |
Direct-drive assembly; clearance driven by side-mount location and door hardware layout. |
| Speed reference | Varies by configuration and door setup. | Designed for high cycle and configurable operation. |
Max RPM by model: HAML-RBH: 65 RPM, HAML-RCH: 115 RPM, HAML-RDH: 190 RPM, HAML-HR10: 35 RPM |
If your site is beyond typical commercial duty levels, select an operator family based on required duty cycle, mounting method, clearance constraints, and environmental exposure.
Use duty cycle and mounting constraints as the first filter, then refine by environment and control requirements.
| Site requirement | Recommended direction | Why it matters |
|---|---|---|
| High traffic, continuous commercial use | GDI JDMG or HAML | Duty cycle is the limiting factor in real-world reliability; high-cycle rating reduces thermal and wear stress. |
| Low headroom trolley installs | GDI JDMG trolley | Low-profile clearance (4.5 in) supports tight headroom constraints where conventional trolley assemblies are difficult. |
| Harsh environments (washdown, corrosion, cold) | GDI sealed controls + appropriate enclosure | GDI cold rating to -40°C does not require a heater, reducing parts, complexity, and winter maintenance. |
| Backup power expectations | Compare cycle counts by load | Battery backup performance varies significantly by door weight, balance, and operating profile; specify minimum cycles required. |
Send your door type, size/weight, lift type, springing/balance details, available voltage, and required cycles/day. We’ll recommend a configuration and options (mounting, hoist/brake, enclosure, and backup power).
