TM 10-3930-659-20 CHAPTER 17 HYDRAULIC SYSTEM MAINTENANCE Paragraph Page Number Paragraph Title Number 17-1 Main Hydraulic Pump Flow Test .......................................................................... 17-2 17-2 Fork/Brake Hydraulic Pump Flow Test................................................................. 17-6 17-3 Fork/Brake Hydraulic Pump Standby Pressure Test............................................. 17-10 17-4 Hydraulic Cylinder Drift/Leakage Tests ................................................................ 17-13 17-5 Fork/Brake Hydraulic Pump Replacement ........................................................... 17-16 17-6 Main Hydraulic Pump Replacement..................................................................... 17-19 17-7 Forklift Control Valve Levers Replacement.......................................................... 17-21 17-8 Forklift Control Valve Replacement ..................................................................... 17-26 17-9 Carriage Tilt Cylinder Replacement ..................................................................... 17-30 17-10 Locking Control Valve Replacement .................................................................... 17-33 17-11 Carriage Assembly Replacement......................................................................... 17-34 17-12 Forks Replacement.............................................................................................. 17-39 17-13 Conveyorized Fork Attachments Maintenance ..................................................... 1745 17-14 Fork/Brake Hydraulic Pump Outlet-to-Forklift Control Valve Hose Replacement..        17-52 17-15 Fork/Brake Hydraulic Pump Drain-to-Hydraulic Reservoir Hose Replacement ..... 17-54 17-16 Main Hydraulic Pump-to-Fork/Brake Hydraulic Pump Hose Replacement............ 17-56 17-17 Fork/Brake Hydraulic Pump-to-Hydraulic Reservoir Hose Replacement............... 17-58 17-18 Hydraulic Reservoir-to-Main Hydraulic Pump Line Replacement ......................... 17-60 17-19 Forklift Control Valve-to-Plate Hoses Replacement ............................................. 17-62 17-20 Forklift Control Valve-to-Transmission Clutch Cutoff Valve Hose Replacement ... 17-64 17-21 Transmission Clutch Cutoff Valve-to-Transmission Control Valve Hose Replacement .............................................................................................. 17-66 17-22 Transmission Clutch Cutoff Valve-to-Hydraulic Reservoir Hose Replacement ..... 17-68 17-23 Carriage Tilt Cylinder Hoses and Lines Replacement........................................... 17-70 17-24 Carriage Tilt Cylinder Lubrication Hose Replacement .......................................... 17-76 17-25                         Fork/Boom Cylinder Hoses and Lines Replacement............................................. 17-78 17-26 Fork Spacing Cylinder Hoses and Lines Replacement ......................................... 17-82 17-27 Plate-to-Loader Frame Bracket Hoses Replacement............................................ 17-86 17-28 Hydraulic Oil Sampling Valve Replacement......................................................... 17-88 17-29 Hydraulic Reservoir Suction Filter Replacement .................................................. 17-90 17-30 Hydraulic Reservoir Breather Filter Replacement ................................................ 17-92 17-31 Hydraulic Oil Return Filter Assembly Replacement.............................................. 17-93 17-32 Fork/Boom Cylinder Replacement ....................................................................... 17-96 17-33 Fork Spacing Cylinder Replacement.................................................................... 17-100 17-34 Fork Spacing Chains Replacement...................................................................... 17-102 17-35 Hydraulic Reservoir Filler Cap and Cover Replacement ...................................... 17-106 17-36 Hydraulic Reservoir Replacement........................................................................ 17-108 17-37 Hydraulic Reservoir-to-Oil Return Filter Line Replacement .................................. 17-114 17-38 Hydraulic Oil Return Filter-to-Priority Valve Line Replacement ............................ 17-116 17-39 Hydraulic Reservoir Drain Valve and Line Replacement ...................................... 17-118 17-40 Hydraulic Schematic............................................................................................ 17-120 17-1

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