VTCA Compatible Two-Speed Valve, Reliable System Integration

1. Shift Logic

1. Solenoid de-energized / No pilot pressure: Full displacement mode → All pistons active, max torque.

2. Solenoid energized / Pilot pressure applied: Half displacement mode → Half pistons cut out, higher speed.

❗ Important: VTCA will NOT automatically shift back to full displacement under overload. You must control the shift signal externally. It does not have torque/pressure overload protection to auto-downshiftManualsLib.

2. Typical Applications

Marine winches, anchor windlass, dredger drives, mining conveyors, shredders, TBM auxiliary drives

3. Rotation Direction Critical Warning (Most common failure point)

• R: Clockwise (viewed from shaft end)

• L: Counter-clockwise

• Piston load increases up to 3 times normal

• Risk of piston roller overheating, scoring, catastrophic motor failure

• Pressure limit reduced to only 210 bar in this conditionManualsLib

4. Installation & Assembly

1. Remove protective cover from CA motor rear flange

2. Fit supplied O-rings onto valve mounting face (use grease to retain O-rings during assembly)

3. Bolt valve onto motor.

4. Align port positions correctly

5. After mounting: Check case drain circuit unobstructed; drain lines must run continuously down to tank (no high loops)

6. Case drain is critical: CA motor with VTCA has forced case oil exchange through valve, blocked drain = rapid motor overheating.

5. Shift Operation Rules (Operating limits)

Shifting at higher speed / higher pressure causes hydraulic shock, piston impact, cam ring damage. Best practice: reduce load + slow down before shifting in winch applications.

6. Working Principle

1. Full displacement mode: All pistons engage → Maximum torque, low speed (winch hoisting / heavy load)

2. Half displacement mode: Half of motor pistons are deactivated → Lower torque, higher speed (light load fast retrieve)

3. Shift signal: Hydraulic pilot pressure solenoid energize to toggle displacement.