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Hoist Fitness Preacher Curl/Triceps Extension HD-3100
Hoist HD-3100 Bicep Tricep Machine
The Hoist HD-3100 is a selectorized bicep tricep machine that trains preacher curls and triceps extensions on a single bi-directional arm. It suits home gyms, hotel and apartment facilities, studios and commercial floors that need both arm movements covered by one frame rather than two.
- SKU—HD-3100
- Load changes—Pin, not plates
- Build options—Standard (HD) or heavy (HDG)
- Seat scale—Seven numbered positions
- Warranty tier—Commercial and light commercial
- Ships from — Tennessee, all 50 states
- Best fit—Shared spaces training both arms
What this bicep tricep machine does
One arm does both jobs. Hoist builds the HD-3100 around a bi-directional exercise arm, so the same lever that you curl against also becomes the extension arm when you work the back of the upper arm. Nothing gets bolted on or swapped out between the two movements.
That matters most where the machine has to earn its place twice a session. A frame that only curls sits idle during pushdown work, which is the reason this model shows up in the wider bicep curl machine collection alongside single-purpose stations.
Does a preacher curl machine train triceps too? Most do not. The HD-3100 is a specific design where the arm drives in both directions, which is what makes the second exercise possible on one frame.
One pin, two different loads
The number on the stack is not the number you lift, and it is not the same on both exercises. Hoist publishes a weight ratio chart in the HD-3100 owner's manual showing that the bicep curl delivers 42% of the selected stack and the triceps extension delivers 35%. Same pin, two different answers.
Read down that chart, and the top position works out to 79.8 lbs on curls and 66.5 lbs on extensions. Nobody selling this category translates the figure, which is why buyers judge these machines on stack size and get surprised by the extension side first.
- Bicep curl ratio—42% of stack
- Triceps ratio—35% of stack
- Top curl load—79.8 lbs
- Top extension load—66.5 lbs
Be aware of one honest gap. Hoist publishes that chart for the standard stack only, so the equivalent figures for the heavy build are not stated in the manual, the specification sheet or anywhere across Hoist's US-built machine range.
Choose the heavy stack if your working sets already sit near those two numbers. If they do not, the standard build has room left in it. Order the configuration that matches your real training loads and add the HD-3100 to your cart today.
What is the difference between HD and HDG? HD is the standard build, and HDG carries the heavier stack. The frame, footprint, and exercises are identical.
Setting it up for each user
Two of the three settings belong to the person, and one belongs to the movement. The seat carries a numbered scale, while the range of motion adjusts separately for the curl and for the extension, so every user ends up with three numbers rather than one.
- Set the seat number that rests your elbows flat.
- Set the range for the curl side.
- Reset the range before the extension work.
- Write all three down for next session.
That sequence takes about a minute the first time and seconds after that, which is worth knowing before you compare it with the selectorized curl stations that only ask for one setting.
Can a beginner set this machine up correctly? Yes. The seat positions are numbered, and each exercise has its own range decal on the frame.
Key features
Every line below is a working benefit rather than a spec repeated back at you.
✅ No attachment swap between exercises
✅ Lower back support built into the seat
✅ Multiple grip options ease wrist strain.
✅ Pin loading keeps rest periods short.
✅ Two stack builds suit different strength
✅ Small 5 lb step available on order
✅ Bolt-down base stays steady under load
✅ Rated for daily commercial floor traffic
✅ Separate home and facility upkeep plans
✅ Hoist publishes load figures per exercise
Full specifications
Figures below come from Hoist's own HD-3100 documentation. The optional 5 lbs. Weight Upgrade carries the part code RS-CAGE-NG-OPT1 and changes both the stack and the shipped machine weight.
Size and footprint
- Product Length—53.75" (137 cm)
- Product Width—48.75" (124 cm)
- Product Height—55.00" (140 cm)
Standard build (HD)
- Machine weight—476 lbs. (216 kg)
- Weight stack — 190 lbs. (86 kg)
- Upgraded weight — 488 lbs. (221 kg)
- Upgraded stack — 195 lbs. (88 kg)
Heavy stack build (HDG)
- Machine weight — 510 lbs. (231 kg)
- Weight stack — 225 lbs. (102 kg)
- Upgraded weight — 522 lbs. (237 kg)
- Upgraded stack — 230 lbs. (104 kg)
Who it fits and who it does not
An honest fit beats a longer feature list, so here are both sides of it.
A good fit if
- Your loads sit inside the published ceilings
- Several people share one arm station
- You can fix a frame to the floor
- You want set changes without loading plates
Skip it if
- You already curl above those figures
- You rent and cannot drill the floor
- You need left and right arms independent
- One movement is all you plan to train
Buyers in that last group are usually better served by dedicated triceps machines or a single-purpose curl frame.
How it compares on our shelf
Three stocked options answer the same question in different ways. The Hoist Biceps Curl RS-2102 trades the second exercise for a dedicated station. The Body-Solid DBTC ProDual station covers both movements for less.
Hoist HD-3100
- Trains—Curls and extensions
- Load — Pin-selected, two build sizes
- Price—$3,960.00
- Right for both arm jobs, one frame
Hoist Biceps Curl RS-2102
- Trains—Curls only
- Load—Pin-selected stack
- Price—$5,226.00
- Right for—Floors curling all day
Body-Solid DBTC ProDual Biceps and Triceps
- Trains—Curls and extensions
- Load — Pin-selected, 210 lb listed
- Price—$3,420.00
- Right for — Lower spend, same two jobs
Weigh those three against your own numbers, then buy the frame that fits your floor plan.
Delivery, assembly, and warranty
Plan for two people and a full afternoon. Hoist calls for a ratchet wrench with 1/2", 9/16" and 3/4" sockets, an adjustable wrench, rubber mallet, tape measure, level and a hex key set, and the weight cage builds from its own separate RS-CAGE-NG manual before the frame is squared and checked for perpendicular.
Hoist also requires the unit to be bolted to the exercise floor using minimum 4-1/2" bolts, warning that failure to do so risks serious injury or death. Treat that as a placement decision made once, not a job to revisit.
- Frame and body—10 years
- Structural moving parts — 5 years
- Bearings, bushings, pulleys—3 years
- Finish, cables, upholstery—1 year
HOIST warranties this product to the original purchaser only and guarantees it to be free from defects in workmanship and materials under normal use or service, applying to manufacturer defects only. HOIST reserves the right to change product specifications, design, and function at any time. Worth noting alongside that: the manual lists cables and belts as scheduled replacement parts, so budget for them as wear items rather than warranty claims, and keep ammonia, acid, and petroleum solvents away from the finish.
Frequently asked questions
Does Hoist publish a user weight limit for the HD-3100?
No. The figure does not appear in the specification sheet, the owner's manual, or the live product listing. Where a hard limit matters for your facility, ask before ordering rather than assuming one.
Can I put this machine in a private home?
Yes, and plenty of buyers do. Hoist's current residential warranty column covers a different group of products, so a homeowner receives the commercial and light commercial schedule instead.
How do I add the 5 lb weight upgrade?
Hoist directs buyers to their dealer for the upgrade, and it fits as part of the weight cage build. Deciding at order time is simpler than revisiting an assembled stack.
Are shipping crate dimensions published?
No. Only assembled dimensions are given, so measure doorways, stairs and turns against those and allow clearance for the crate on top.
Is the warranty transferable if I sell the machine?
No. Coverage applies only to the original purchaser and is not assignable to a second owner.
Can two people train on it at once?
No. One seat and one exercise arm mean one user at a time, which is worth planning around on a busy circuit.
Ready to order? Buy the Hoist HD-3100 now and cover both arm movements on one frame, backed by Hamilton Home Fitness and a clear 30-day return window on undamaged equipment in its original packaging — the full shipping and return terms are worth two minutes before you check out. Fitting out a whole strength floor instead? Our gym design service plans the layout around it.
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