| |
| Illustration 1 | g06193753 |
|
View of Hoist Pump and Screens (1) Pump Drive Group (2) Gear Pump Group (3) Screen Group (4) Bypass Switch (5) Control Valve Group | |
The hoist system is supplied with oil by the two-section, fixed displacement gear pump group (2). Gear pump group (2) mounted at the rear of pump drive group (1). Each gear pump section draws oil from the hydraulic oil tank. Each gear pump section can produce a flow rate of
Oil flows through high-pressure hoses from gear pump group (2) , then through two screen groups (3) before entering control valve group (5).
Bypass switches (4) are installed along screen groups (3) and monitored by the Chassis ECM. Bypass switches (4) are normally open until screen groups (3) become impregnated with debris and oil flow is restricted. Restricted oil flow causing pressure differential across the screens will close bypass switches (4). A pressure differential is