TM 10-3930-671-24 APPENDIX D SCHEMATICS AND DIAGRAMS D-1. INTRODUCTION. This appendix provides 4K Forklift Truck wiring and hydraulic diagrams.  The diagrams are divided into the following areas: Main Wiring Diagram Figure D-1 Hydraulic Diagram Figure D-2 Brake Hydraulic Diagram Figure D-3 D-1