I Ching Site -

Nine in the second place means:

The axletrees are taken from the wagon.

Here advance is checked just as in the third line of The Taming Power Of The Small (9). However, in the later the restraining force is slight; thus a conflict arises between the propulsive and the restraining movement, as a result of which the spokes fall out of the wagon wheels, while here the restraining force is absolutely superior; hence no struggle takes place. One submits and removes the axletrees from the wagon–in other words, contents himself with waiting. In this way energy accumulates for a vigorous advance later on.