Hoist Preacher Curl/Triceps Extension - HDG-3100

Hoist Preacher Curl/Triceps Extension - HDG-3100

The HOIST Preacher Curl/Triceps Extension with its bi-directional arm and multiple range-of-motion adjustments allows for performance of both biceps and triceps exercises all in one machine. Multiple grip options and seven seat adjustments for varying user heights also comes standard with this machine. The HD-3100 is part of HOIST’s HD Dual Series line, offering a comprehensive solution for fitness facilities where space, budget or both are at a premium.

Features

• Bi-directional arm allows performance of biceps and triceps exercises in one machine
• Seven seat pad adjustments for varying user heights
• Multiple range-of-motion adjustments for both exercises

What our Experts Think

• Dual-function arm design: A bi-directional movement arm allows both preacher curl (biceps) and triceps extension training in one compact station for maximum exercise efficiency.
• Strict isolation mechanics: The preacher pad stabilizes the upper arms, reducing momentum and ensuring clean, targeted muscle engagement for both biceps and triceps.
• Highly adjustable setup: Multiple seat height positions ensure proper alignment for users of different sizes, improving comfort and training precision.
• Variable range-of-motion control: Adjustable ROM settings let users fine-tune resistance curves for both curl and extension movements.
• Space-saving commercial solution: Combines two essential arm stations into one machine—ideal for gyms optimizing floor space without sacrificing functionality.
• Smooth selectorized resistance: Designed for consistent load delivery, making reps controlled, joint-friendly, and suitable for progressive overload.
• Heavy-duty commercial build: Built for high-traffic environments with long-term durability and stable performance under frequent use.

Q&A

Q: What is the Hoist HDG-3100 Preacher Curl / Triceps Extension?
A: The Hoist HDG-3100 is a commercial-grade dual-function strength machine that allows users to perform both biceps preacher curls and triceps extensions on a single station using a bi-directional arm system.

Q: What makes the HDG-3100 unique?
A: It features a bi-directional moving arm that switches between curl and triceps modes, plus multiple range-of-motion adjustments for optimized muscle targeting and joint-friendly movement.

Q: What muscles does it train?
A: It isolates the biceps brachii (curl mode) and the triceps (extension mode), making it a true upper-arm isolation machine for balanced arm development.

Q: Is it suitable for commercial gyms?
A: Yes, it is built for full commercial use with a heavy-duty frame and weight stack system designed for high-traffic strength training facilities.

Q: What is the weight stack on the HDG-3100?
A: The heavy stack version includes up to a 225 lb (102 kg) weight stack, with adjustable options depending on configuration.

Q: How adjustable is the machine?
A: It includes 7 seat height positions plus multiple arm range-of-motion settings to accommodate different user sizes and training styles

Maintenance Tips

• Daily cleaning: Wipe arm pad, handles, seat, and frame to prevent sweat buildup and vinyl deterioration.
• Inspect bi-directional arm: Weekly check smooth rotation between curl and triceps modes; ensure no stiffness or misalignment.
• Cable & linkage check: Look for wear, slack, or uneven tension in movement arms and internal resistance paths.
• Pivot lubrication (light): Apply minimal lubricant to joints only if motion feels stiff—avoid over-lubing to prevent dust buildup.
• Seat adjustment system: Test all 7 seat positions regularly to ensure secure locking and smooth sliding. 
• Tighten hardware: Periodically secure bolts and frame joints to maintain stability under heavy commercial use (~475–510 lb unit weight). 
• Range-of-motion mechanism: Ensure adjustment points move freely and lock firmly for both exercises.
• Upholstery care: Use mild, non-abrasive cleaner to preserve arm pad comfort and durability.
• Frame inspection: Check welds and support structure monthly for early signs of stress or wear.
• Deep cleaning: Remove dust from pivot zones and underside components to maintain smooth operation.