Click here to make tpub.com your Home Page

Page Title: Range of crane movement
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 




img
MIL-T-62735
3.8 Crane. When specified for class 23 to 29 stake trucks (see 6.2), the vehicle shall
have a frame mounted one man operated, fully hydraulic articulated boom type crane, between
the cab and the stake body. The boom shall have an upper and lower section and a hydraulically
operated extendable jib.
3.8.1 Crane capacity. The crane shall be capable of lifting a minimum load of 2720 kg
(6,000 pounds) when the load is located at a radius of 1520 mm (5 feet); and 1130 kg
(2,500 pounds) when the load is located at a radius of 3960 mm (13 feet), without causing the
vehicle to become unstable. The vehicle shall be deemed unstable when anyone of the vehicle
wheels lifts off the ground.
3.8.2 Range of crane movement. The jib shall be capable of extending not less than
840 mm (33 inches). The boom, when fully extended, shall have a normal lifting range of
7600 kg (25 feet) above ground level. The boom shall fold to a nestable travel height, between
the truck body and the cab, not more than 2130 mm (84 inches) above the truck chassis frame.
3.8.3 Crane outriggers. The crane shall have double-acting hydraulic outriggers
independently controlled and integrally mounted to the crane base. Each outrigger landing pad
shall be not less than 900 cm2 (140 square inches) in area.
3.8.4 Crane check valves. The boom and outriggers shall have a check valve type
locking system to prevent the load from dropping or the outriggers from retracting due to
hydraulic or power failure.
3.8.5 Crane controls. Both sides of the vehicle shall have a full set of crane controls, and
an outrigger control for the outrigger on that side of the vehicle. The crane and outrigger
controls shall be accessible from ground level. Controls shall be of the self-centering, fail-safe
type with hydraulic bypass overload valves. Crane controls shall have fine metering qualities for
variable raising, lowering and rotating rates of motion of the crane boom.
3.8.6 Crane hydraulic system. The crane shall have a PTO driven hydraulic pump with
PTO controls in the cab, identified in accordance with 3.10.5. The pump shall be of the positive
displacement type. The pump shall provide a working pressure of not less than 12.4 Mpa
(1,800 psi). The crane hydraulic system shall contain the following minimum safety features:
(a) Check valve system in the boom and outrigger systems to prevent load drop due to
hydraulic system failure.
(b) Flow valve in hydraulic lines or the cylinder to prevent boom damage due to sudden
load-lowering stops.
(c) Cushioning valves in the boom rotating hydraulic system of rack- and-pinion
mounted cranes to prevent damage due to sudden stops.
55

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business