Model 4700 Maintenance Manual
Section 8. Theory of Operation
Standard Lever Controls
Options Standard Lever Controls Bottler’s Tilt Bottler’s Tilt allows the mast to be tilted further forward when under free lift mast height. The limit is 9° forward, 6° backward. The option is controlled by two switches, a Blocking Solenoid (EV12), and a Tilt Limit Solenoid (EV13). When the forks are fully lowered and the mast is centered, the End of Free Lift switch (SW16) and the Angle Tilt Proximity switch (SW30) are normally closed. When tilt is requested, tilt functions as normal. However, when the forks are elevated above free lift, SW16 opens, causing a change in state to be seen at the VM. If tilt is then requested, the VM allows forward Tilt until it sees a change in state of SW30. If the VM sees SW16 and SW30 open, it commands the Tilt Limit Solenoid (EV13) to activate, stopping return flow from the tilt cylinders and preventing further forward tilt. If the mast is then lowered until SW16 closes, tilt forward is allowed.
Options de-energizes EV12, blocking fluid to the lift cylinders. To continue lifting, PB9 must be depressed and the lift request resumed.
Finger Tip Controls Bottler’s Tilt Same as for a lever controlled truck with the exception of the Tilt Limit Solenoid. When the VM senses a change in state at the switches that limit lift or tilt, the VM sends a communication message to the Hydraulic Control Board. The Hydraulic Control Board then removes the request for the requested function.
Lift-Limit with Bypass Same as for a lever controlled truck with the exception of the Blocking Solenoid (EV12). When the VM senses a change in state at the switches that limit lift, the VM sends a communication message to the Hydraulic Control Board. The Hydraulic Control Board then removes the request for the requested function.
If lift is requested while the mast is tilted fully forward, lift is allowed until the End of Free Lift switch opens. When the VM again sees SW30 and SW16 open, it de-energizes the Blocking Solenoid (EV12), blocking flow to the lift cylinders. When the mast is tilted back until SW30 closes, EV12 is energized, allowing flow to the lift cylinders.
Lift-Limit with Bypass Lift-Limit with Bypass consists of a switch placed on the mast that prevents lift past a certain height. To lift beyond this height, the operator must activate a switch. This is accomplished by having a Mast Height switch (SW31), Lift-Limit Push Button switch (PB9), and a Blocking Solenoid (EV12). If switch SW31 is opened during a lift request, the VM sees the change of state and
Publication 1160093, Issued: 20 May 2013
8-13
