John Lambert,

Thanks much. Enjoy your tag line. It is hard to enjoy life just being vanilla (or grey as you say). In a book from the late 60's , "Temple of Gold", Wm Goldman wrote we are not remember for living in the natural orbit of our lives but rather for the times when we leave it.

Hi Johnr

Excellent response - in fact all normal forklifts are designed to be operated on flat hard surfaces with a slop of no more than 2% - and this is critical in any area where loads are raised/ lowered

1.) You will find that very few, if any, manufactuers publish a gradability % for low lift walkie, order selector or narrow aisle equipment as the intended application for these units in on a flat level operating surface found in warehousing oprations.

2.) the ANSI/ASME standards for parking brake holding capability should not be interrputed as the capability of the unit to climb a grade. For example, a stand-up rider, reach truck (North American style) has about 1.25 to 1.5" under clearance at the outriggers. It would not be feasible for such unit to negoitate the break over point on a 15% grade. Further, it is highly unlikely a highlift order selector (picker) can negoitate a 5% grade without getting hung up on the frame side skid plates nor would teh operator want to be at 300" in the air on a 5% slope w/o a parachute or bungy cord.

3.) To operate a MPB 040 on a 10% ramp with a load will significantly shorten the run time on a fully charged battery pack to vs an expected 3-4 hour operating time on normal flat surfaces. Also to ooerate this unit or similar units on a ramp will shorten the life of the typically small drive motors found in them.
You need to confirm with your dealer their recommendation based on your operating duty cycle - the machine maybe able to negotiate that ramp if you only do it once a day. And get it in writing from them and /or Yale.

Yale claims compliance with ANSI B56-1:
Cluase 7.17 Parking Brake System Performance for Trucks Up to and Including 50 000 kg Capacity
7.17.1 A parking brake (or mechanism) that may be a part of, or include the service brake shall be provided and be capable of holding the truck on the maximum grade that the truck can climb with rated capacity load, or on the following grade, whichever is the lesser:
(a) order picker, high lift: 5%
(b) order picker, low lift: 10%
(c) motorized hand and hand/rider: 10%
(d) sit-down rider, electric or combustion powered: 15%
(e) stand-up rider, electric or combustion powered: 15%

The inference is that 10% is the maximum slope fpr the Yale MPB040-E
But I would strongly recommend you do a thorough risk assessment of any operation on a 10% slope including consideration of loss of the load and or loss of control