Materials handling vehicle having a manifold located on a power unit for maintaining fluid pressure at an output port at a commanded pressure corresponding to an auxiliary device operating pressure

A materials handling vehicle comprising:

• a power unit;
• a work assembly coupled to said power unit comprising a first auxiliary device;
• and
• a fluid supply system comprising:
• pump structure for supplying a fluid;
• a first manifold apparatus located on said power unit and receiving fluid from said pump structure, said first manifold apparatus comprising valve structure for maintaining fluid pressure at an output port of said first manifold apparatus at a commanded pressure substantially equal to or greater than an operating pressure of said first auxiliary device;
• a second manifold apparatus located on said work assembly;
• fluid supply line structure coupled between said first and second manifolds;
• an electronic controller coupled to said valve structure for generating a control signal to said valve structure causing said valve structure to maintain fluid pressure at said output port at said commanded pressure, said control signal being generated by said controller in response to receiving an operator-generated command to actuate said first auxiliary device;
• said work assembly further comprises a mast assembly and a fork carriage apparatus, said fork carriage apparatus comprises:
• a fork carriage mechanism;
• a pair of forks mounted to said fork carriage mechanism for movement with said fork carriage mechanism;
• and
• a movement mechanism associated with said fork carriage mechanism to effect movement of at least a portion of said fork carriage mechanism and said forks, wherein said movement mechanism defines said first auxiliary device.