1.44 HYDRAULICS Autohitch cylinder (58) The autohitch cylinder, if fitted, is located on the rear of the machine and is used to automatically connect and lift a trailer onto the machine. The pressure oil supplies to the autohitch cylinder are from the autohitch manifold (57). Specification Stroke 325 mm Bore 60 mm 1st service couplings (59) . The 1st service couplings (not illustrated) are of the quick-release type and are used to attach hydraulic services to the front of the machine. 2nd service couplings (60) The 2nd service couplings are of the quick-release type and, if fitted, are used to attach a second hydraulic attachment to the front of the machine.
Trailer tipping connection (61) The trailer tipping connection (not illustrated) is of the quick-release coupling type and, if fitted, connects hydraulic supplies to the trailer tipping service. Start-up valve (62) The start-up valve is fitted in the hydraulic supply line between the LS hydraulic pump (2) and the control valve PVSP inlet section (36). An internal spring valve opens the start-up valve to divert fluid to the hydraulic tank (1) when the engine is being started, offloading the build-up of pressure. When the LS hydraulic pump builds up sufficient pressure, the fluid pressure overcomes the spring valve, which closes and prevents fluid from flowing back to the hydraulic tank (1).