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.

Showing 1–12 of 18 results

Crank Handles

$25.00$45.00
Crank Handles & Drill Cranks, with hook for loop input gears: 7:1, 13:1, and 15:1
Select options This product has multiple variants. The options may be chosen on the product page

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
Select options This product has multiple variants. The options may be chosen on the product page

Single Output, Hand Brake

$250.00$300.00
Manual operator with 0.625″ output shaft, guide wheels and handle that serves as a brake
Select options This product has multiple variants. The options may be chosen on the product page

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)

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

Gear Loop Replacement

$8.00$12.00
Replacement Gear Loops for 7:1, 13:1, and 15:1
Select options This product has multiple variants. The options may be chosen on the product page

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 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 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 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 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

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