Xtreme Manufacturing XR5919 Operation And Safety Manual page 67

Preventive Maintenance
Fig 92. Lift Cylinder Lower Down Valve
10. Thread a 125mm long M8-1.25 capscrew into the manual
operator of the lift/lower section on the proportional
control valve (first section from boom side, on top of the
valve) and use it to manually operate the valve to lower
the boom. Be aware of lowering the boom to avoid pinch
points and crushing hazards.
Fig 93. Lift/Lower Sections of Proportional Valve
11. When boom is fully lowered, tighten valve with hex
wrench, then tighten nut to secure valve.
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Operation Manual