Part of the New Holland Repair Manuals.
This 104-page New Holland L-451, L-452, L-454, L-455 Skid-Steer Loader Service Manual (OEM #40045140) puts the full hydrostatic drivetrain, gear pump, and control valve procedures in your hands, right down to Cessna and Victor valve variants. Inside you get complete wiring diagrams for the alternator and regulator circuit, hydraulic schematics covering the charge and relief systems, and a troubleshooting section built around real symptoms: loader creeps, loss of propulsion, boom arms that won't hold. Set your hydrostatic charge pressure to 90 PSI (620 kPa) cracking pressure, and torque that castellated axle nut to just 2-6 in. lbs. (0.35-1.05 N-m); numbers you won't find guessing off a parts-store chart. Your alternator should read 37 amps, and the L-455 crankcase holds 7 quarts with the filter. No more chasing an electrical gremlin with a test light and hope. Bookmarked by section, it opens on any device, so bring it to the bay and get that final drive chain adjusted right the first time.
What's Inside This New Holland L-451, L-452, L-454, L-455 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 4-6 | |
| Operation | 7-10 | Hydrostatic Transmission, Boom Hydraulic Systems, Tandem Pump, Gear Pump, Piston Pumps, Piston Motors, Steering Control Levers, Neutralizers |
| Steering Adjustments | 11-12 | Neutralizer, Neutralizer Tube Assembly, Control Arm Yokes, Control Arm Stop Bolts, Transmission Pintle Shaft, Rubber Connector |
| Hydrostatic Transmission Removal | 13-16 | Hydrostatic Pumps, Hydrostatic Motors, Tandem Pumps, Hydraulic System, Gear Pump, Steering Neutralizers, Pintle Lever Control Arms, Hydrostatic Pump Assembly |
| Hydrostatic Pump Overhaul | 17-24 | Pump Housing, Hydrostatic Pump Coupler, Transmission Mount, Hydrostatic Pump Assembly, Valve Blocks, Rotating Piston Block, Piston and Shoe Assembly, Shoe Plate |
| Hydrostatic Transmission Motors | 25-30 | End Cap, Mount, Sprocket, Snap Ring, Seal, Retaining Cap Screws, Back Plate, Piston Block |
| Gear Pump | 31-36 | Drive Gear Shaft, Idler Gear Shaft, Back Plate, Front Plate, Body |
| Boom and Bucket Cylinders | 37-40 | Boom Cylinders, Bucket Cylinders, Boom Cylinder Cushion Valve |
| Control Valve | 41-48 | Main System Relief Valve, Lift Check Valves, Spools and O Rings, Cessna Control Valve, Victor Control Valve |
| Final Drive | 49-60 | Chain and Gear-Sprocket Disassembly, Axle, Intermediate Shaft, Eccentric Bearing Caps, Reassembly, Final Drive Chain Adjustment |
| Electrical System | 61-68 | Alternator, Regulator, Isolation Diode, Excitation Voltage Test, Regulator Bypass Test |
| Seat Activated Boom Lockout | 69-72 | Boom Lock Arms, Ignition Switch, Seat Switch, Solenoid, Hydraulic Pressure |
| Troubleshooting | 73-80 | Hydraulic System, Transmission, Electrical System, Loader Creeps, Loss of Propulsion, Boom Arms |
| Specifications | 81-100 | Diesel Engines, Gas Engines, Capacities, Electrical System, Hydrostatic Transmission, Hydraulic System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Alternator Capacity | 37 Amp | p. 83 |
| Castellated nut torque (to turn axle) | 2 in. lbs.-6 in. lbs. (0.35 N·m-1.05 N·m) | p. 55 |
| Fuel Tank Capacity | 10 gal. (38 L) | p. 83 |
| L-455 Crankcase Capacity (includes filter) | 7 qts. (6.7 L) | p. 81 |
| Hydrostatic Charge Pressure Setting | 90 PSI (620 kPa) Cracking Pressure | p. 83 |
| Boom Cylinders Bore | 1 1/2" (38 mm) | p. 84 |
| Hydrostatic pump to engine bell housing bolt torque | 25 ft. lbs. (34 N·m) | p. 13 |
