Case 85xt 90xt 95xt Skid Steer Workshop Service Manual The XT Line of Skid Steers have an interlock system that requires the operator to be in the seat with the lap bar in the operating position before the loader controls can be activated, the parking brake releases and the travel controls will activate.
This interlock consists of a power feed through a 10 amp fuse in the fuse block (8) to a seat switch (26) beneath the seat. This power feeds through a seat plate switch (26A) that assures that the ROPS is secured properly. This power feed flows to the right cluster terminal (31) to illuminate the operator presence lamp and also to the left cluster 6 pin connector (25), pin number 4 (cavity F) supplying input signal power to the seat timer. Case 85xt 90xt 95xt Skid Steer Workshop Service Manual
When the seat switch and seat plate switch close, the seat timer powers the left cluster 6 pin connector, pin number 6 (cavity C) supplying power to the remainder of the interlock circuit. The seat timer maintains power at the seat timer output, terminal 6, for 2 seconds after the seat switch opens to allow the operator to momentarily rise from the seat while still maintaining control function.
Case 85xt 90xt 95xt Skid Steer Workshop Service Manual
Power output from the left cluster 6 pin connector, pin number 6 travels to the seat bar switch. With the seat bar in the down position, power flows through the seat bar switch (27) to the right cluster to illuminate the seat bar indicator lamp and also to the control coil, terminal 85 of the interlock relay. This power feed to the control coil causes the interlock relay (7) to interconnect terminal 30 and terminal 87. Terminal 30 of the interlock relay receives power from the same 10 amp fuse that powers the seat switch.
Case 85xt 90xt 95xt Skid Steer Workshop Service Manual The interlock system secures the loader control valve in neutral unless the operator is in the seat with the lap bar in the operating position. There is a solenoid valve (9) in the loader control valve that, when activated, sends charge pressure oil to release a plunger securing the spools in neutral. When the interlock relay closes, power flows to the loader valve solenoid. Between the interlock relay and the loader valve solenoid, the power flows through a diode (10) in a harness connector. This connector is in the harness to provide for a European requirement and the diode acts only as a jumper across the terminals.
The interlock system also engages the parking brake and neutralizes the travel controls. A neutral override (NOR) solenoid (41) on the hydrostatic pump controls these functions. There is also a push-button control (46) in the left hand control that can also engage the parking brake and neutralize the travel controls. Power for this circuit begins at terminal 87 of the interlock relay. Power then flows to the parking brake switch in the left hand control. Power then flows to the NOR solenoid on the hydrostatic pump. The NOR solenoid controls the travel controls and also the release of the spring applied, hydraulically released parking brake.
There is a parking brake indicator lamp in the left hand instrument cluster that requires a power feed to illuminate. This power flows through a normally closed pressure switch (24) in the brake disengage hydraulic line. This switch opens when the charge pressure is ported to the parking brake from the NOR solenoid. Power for the brake pressure switch comes from the same 10 amp fuse that feeds the seat switch and the interlock relay. When the parking brake is engaged, power then flows to the left cluster, 6 pin connector, pin number 5 (cavity D), to illuminate the park brake indicator.