tilt cylinder 24 via a fluid path which includes the fluid line 68 the check valve 64 and the fluid line 72 thereby urging or extending the rod 27 out of the housing 25 operation fluid is exhausted from the rod end port 24b of the tilt cylinder 24 via the fluid line 80 the exhausted operation fluid is not permitted to advance from the outlet to the inlet of the check valve 74 but rather is advanced to the operation fluid reservoir 94 via a fluid path which includes the fluid line 92 the relief valve 86 and the drain line 96 note that the pilot signal which actuates the relief valve 86 is exhausted to the pilot reservoir 128 via the pilot drain line 154 moreover the pilot signal which actuates the directional valve 46 is exhausted to the pilot drain line 154 and hence the pilot reservoir 128 via the pilot drain line 156 in order to tilt the telescoping arm 16 see fig1 upwardly i e retract the tilt cylinder 24 the switch 112 is depressed thereby positioning the switch 112 in the closed or second switch position and the lever 106 is moved downwardly relative to the view in the fluid schematic of fig2 hence the pilot valve assembly 109 is placed in electrical contact with the voltage potential b and is therefore moved from the first valve position as shown to the second valve position more specifically the pilot valve unit 110 is moved from the third pilot position as shown to a fourth pilot position moreover the downward movement of the lever 106 causes the directional valve 104 to be moved from the.