Our greenhouse curtain cranks allow you to easily roll up your greenhouse sidewall curtains. Simple and reliable manual hand cranks. Choose from single or dual output. Reliable and low-cost ventilation.

Operating your manual ventilation system requires the right greenhouse curtain cranks and mounting method. Get a curtain crank with the correct gear ratio for quick and easy cranking.

Whether you require guide wheels for a curtain operation or mounting plates for a stationary, drive shaft operation, we have the right manual operator for you.

If you have any questions about our manual gear cranks, be sure to contact one of our experts.

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Single Output, Internal Brake

$125.00$373.00
Manual operator with a 1/2″ square adapter slot and guide wheels. Choose from hand or drill powered and easy rolling

Dual Output, Internal Brake

$185.00$405.00
Dual output, manual operator with a 1/2″ square adapter slot and guide wheels.

Single Output, Hand Brake

$250.00$300.00
Manual operator with 0.625″ output shaft, guide wheels and handle that serves as a brake

Crank Handles

$25.00$45.00
Crank Handles & Drill Cranks, with hook for loop input gears: 7:1, 13:1, and 15:1

Roll Bar Adapters

$15.00$120.00
Roll Bar Adapters that provide the means to couple your roll bar to the gear crank or motor of your

Gear Loop Replacement

$8.00$12.00
Replacement Gear Loops for 7:1, 13:1, and 15:1

48″ Manual Gear Crank 7:1 Gear Box

$225.00
48″ Manual Gear Crank, w/ 7:1 gear box & hand crank (max 500 SF curtain material)

96″ Manual Gear Crank 7:1 Gear Box

$240.00
96″ Manual Gear Crank, w/ 7:1 gear box & hand crank (max 500 SF curtain material)

Gear Chain Wheel Crank 15:1 For Sidewall Curtains

$375.00
Gear Chain Wheel Assembly 15:1 ratio, 1/2 x 1/2 square output w/ 4 wheel guide assembly, 26′ chain and chain

Rollbar Adapter for Internal Brake Gears – Fits 1″ OD Pipe

$33.00
Roll bar adapter for 7:1, 13:1 and 15:1 gears. 1/2″ square shaft adapts to 1″ OD ( .9″ ID) roll

Rollbar Adapter for Internal Brake Gears – Fits GGSI 1.5″ OD Pipe

$50.00
Roll bar adapter for 7:1, 13:1 and 15:1 gears.1/2″ square shaft adapts to GGSI 1.5″ OD aluminum roll bar, .750

Rollbar Adapter for Internal Brake Gears – Fits 2.3″ Aluminum Roll-Bar

$66.00
Roll bar adapter for 7:1, 13:1 and 15:1 gears. 1/2″ square shaft adapts to 2.3″ aluminum roll-bar using a 1.5″

Rollbar Adapter for Internal Brake Gears 2 Way – Fits 1″ OD Pipe

$37.50
2 directional roll bar adapter for 7:1, 13:1 and 15:1 gears. 1/2″ square shaft adapts to 1″ OD ( .9

Adapter for Internal Brake Gears 2 Way – Fits 2.3″ Roll-Bar

$105.00
2 directional roll bar adapter for 7:1, 13:1 and 15:1 gears. 1/2″ square shaft adapts to 2.3″ aluminum roll-bar, 1.5″

Rollbar Adapter for LVM60/100 Motor – Fits 1.5″ OD Pipe for Rack & Pinion

$55.00
Roll-bar adapter for 60 and 100 nm motor and GC5:1B manual operator, adapts to GGSI 1.5″ OD aluminum roll bar,

Rollbar Adapter for LVM60/100 Motor – Fits 2.3″ Aluminum Roll Bar

$62.50
Roll bar adapter for 60 nm/100 nm motors and gc5:1b manual operator, adapts to 2.3″ aluminum roll bar, 1.5″ square

Rollbar Adapter for LVM180/200 Motor – Fits 2.3″ Aluminum Roll Bar

$67.50
Roll-bar adapter for 180 nm motor, adapts to 2.3″ aluminun roll bar, 1.5″ square steel insert

Rollbar Adapter for Hand Brake Gears – Fits 1″ OD Pipe

$35.00
Roll bar adapter for 5:1 and 10:1 gears. 5/8″ round shaft, adapts to 1″ OD (.91″ ID) roll bar pipe

Rollbar Adapter for Hand Brake Gears – Fits 2.3″ Aluminum Roll Bar

$67.50
Roll bar adapter for 5:1 and 10:1 gears. 5/8″ round shaft, adapts to 2.3″ aluminum roll bar, 1.5″ square steel