Hydraulic pump for trailer supports - has pump and hydraulic reservoir in common casing, with pump inclined to chassis longitudinal axis

摘要

The stationary supports of a trailer are lowered and raised hydraulically. A pump (11) is mounted on the trailer for this purpose. The pump casing contains a reservoir (10) and extends above the reservoir to form a cylinder block (9). Three pistons (16) are made to reciprocate in the block by cams (17) on a manually turned shaft (18). The pistons have hollow interiors which have ball valves (27, 28) communicating with the reservoir. Further ball valves (30) at their outer ends communicate with the discharge pipe (33) to the support operating cylinders. The supports are retracted by return of fluid through a manual valve (36).