Part of the New Holland Repair Manuals.
An hour from now you could be cracking a head cap loose on a leaking boom cylinder, this 135-page New Holland LB-620 service manual PDF (OEM ID 40062010) propped open beside the loader backhoe. Coverage runs from brakes and cylinders through the transfer gearbox, hydrostatic pump and motor, steering motor, and gear pump. Wiring diagrams trace the alternator and starter circuits, hydraulic schematics map oil flow through the Kontac and Gresen valve stacks, and exploded views back up every cylinder rebuild. Set brake pad to disc clearance at 0.015 to 0.035 in., check master cylinder pedal free play, then pull the bucket cylinder piston nut to 320 ft. lbs. (434 N·m). Every hour this backhoe sits is work you can't bill. Pay once, download the bookmarked, keyword-searchable file, and it stays yours for as long as you own the machine.
What's Inside This New Holland LB-620 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 4 | Personal Safety, Machine Safety, Precautionary Statements, Safety Decals |
| Brakes | 5-12 | Parking Brake, Foot Brake |
| Cylinders | 13-38 | Backhoe Bucket Cylinder, Boom Cylinder, Crowd or Dipper Cylinder, Swing Cylinder |
| Electrical System | 39-46 | Alternator, Starter |
| Engines | 47-48 | Diesel Fuel, Crankshaft Rotation, Governor, Valve Clearance, Oil Filter, Crankcase Capacity |
| Final Drives | 49-50 | Limited Slip Differential, Axle Assemblies, Drive Shafts, Wheel Hub, Bearings, Universal Bearings |
| Transfer Gearbox | 51-58 | Gearbox Cover, Shifter Fork Shaft, Output Shaft, Intermediate Shaft, Bearing Caps, Oil Seals |
| Hydraulic System | 59-68 | Hydraulic Oil Flow, Troubleshooting |
| Hydrostatic Pump and Motor | 69-84 | Hydrostatic System Repair, Hydrostatic Pump Disassembly, Hydrostatic Motor Disassembly |
| Steering Motor | 85-96 | Removing the Steering Motor, Servicing Power Steering Unit |
| Hydraulic Pump | 97-102 | Gear Pump, Back Plate Assembly, Adaptor Plate, Shaft and Gear Assembly, Roller Gear Assembly, Diaphragm Seals |
| Valves | 103-128 | Backhoe Valve Stack, Kontac Valve, Gresen Valve |
| Adjustments | 129-132 | Loader Valve Control Cables, Parking Brake, Foot Brake, Back-Up Alarm, Neutral Safety Switch, Hydrostatic Neutral Adjustments |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Brake caliper bolts torque | 53 ft. lbs. (71 N·m) | p. 5 |
| Brake pad to disc clearance | 0.015"-0.035" (0.38 mm-0.89 mm) | p. 6 |
| Master cylinder pedal free play | 3/4"-1" (19 mm-25 mm) | p. 6 |
| Piston nut torque (Bucket cylinder) | 320 ft. lbs. (434 N·m) | p. 16 |
| Head cap torque (Bucket cylinder) | 25 ft. lbs. (34 N·m) | p. 16 |
| Steering (Cessna) Piston Nut Torque | 70-80 ft. lbs. | p. 61 |
| Charge pressure | 100 PSI (689 kPa) | p. 84 |
| High pressure relief valve setting | 4500 PSI (31,027 kPa) | p. 84 |
| Parking Brake Bolt Torque | 53 ft. lbs. (71 N·m) | p. 5 |
| Bucket Cylinder Piston Nut Torque | 320 ft. lbs. (434 N·m) | p. 16 |
| Boom Cylinder Head Cap Torque | 25 ft. lbs. (34 N·m) | p. 19 |
| Engine Oil Capacity | 6 qts. (5.7 L) | p. 47 |
New Holland LB-620 Common Problems This Manual Covers
New Holland LB-620 loses travel power forward and reverse after warm-up, backhoe hydraulics still strong
Run the hydrostatic start-up and pressure test on page 84 with the oil at operating temperature. Verify charge pressure holds 100 PSI (689 kPa); if it falls off as the machine warms, internal leakage in the hydrostatic pump or motor is bleeding your drive power. Confirm the high pressure relief valves hold 4500 PSI (31,027 kPa) before pulling either unit.
Manual Section: Hydrostatic System Start-Up Procedure p. 84Travel power fades climbing grades while loader and backhoe circuits stay strong
Inspect the propulsion control linkage at the front hydraulic pump for bent rods, worn pivots, or a broken hydroback connection; these fail far more often than the pump itself. Then work through the hydrostatic transmission checks starting on page 66. If drive pressure cannot reach the 4500 PSI (31,028 kPa) relief setting under stall, plan on pump or motor repair.
Manual Section: Hydraulic System Troubleshooting p. 66Swing cylinder seals leaking, boom swing drifts to one side under load
Rebuild the swing cylinder with a full seal kit instead of chasing one leak at a time. Pull the cylinder using the procedures in the cylinder section starting on page 13 and inspect the 3.0 inch bore for scoring. On reassembly, torque the piston nut to 320 ft. lbs. (434 N·m) and the head cap to 25 ft. lbs. (34 N·m).
Manual Section: Cylinders p. 25Parking brake will not hold on slopes, lever pulls all the way up
Adjust the parking brake cable tension using the procedure on page 130, then set brake pad to disc clearance at 0.015 inch to 0.035 inch (0.38 mm to 0.89 mm). If the pads are worn out, replace them and torque the caliper bolts to 53 ft. lbs. (71 N·m) per the brake service procedures on page 5.
Manual Section: Parking Brake Adjustment p. 130Hydraulic pump whines and loader lifts slowly once the oil warms up
Check the reservoir level first; it holds 16 gal. (60.6 L), and a low level lets the pump pull air and whine. Inspect the suction line and hose clamps for leaks. If noise continues with full, clean oil, rebuild the gear pump per page 97 and torque the cap screws to 25 ft. lbs. to 28 ft. lbs. (34 N·m to 38 N·m).
Manual Section: Hydraulic Pump p. 97Frequently Asked Questions
What is the torque specification for the New Holland LB-620 backhoe bucket cylinder piston nut?
The torque specification for the backhoe bucket cylinder piston nut is 320 ft. lbs. (434 N·m). p. 16
What is the valve clearance for the New Holland LB-620 engine intake and exhaust valves?
The intake valve clearance is 0.008 inches (0.20 mm) and the exhaust valve clearance is 0.012 inches (0.30 mm). p. 47
What is the crankcase oil capacity for the New Holland LB-620 engine when changing the filter?
The engine crankcase capacity with a filter change is 6 quarts (5.7 liters). p. 47
What is the recommended hydrostatic oil filter service interval on the New Holland LB-620?
The hydrostatic oil filter should be replaced after the first 25 hours of use and every 250 hours thereafter. p. 69
What is the torque specification for the New Holland LB-620 transfer gearbox output shaft cap screw?
The Grade 8 1/2 inch x 1 1/2 inch cap screw in the gearbox output shaft must be tightened to 115 ft. lbs. (155 N·m) torque. p. 11
What format is this New Holland LB-620 manual in?
One searchable PDF covering 135 pages, delivered instantly. No disc, no shipping, no waiting on the post.
Does this New Holland LB-620 manual allow printing?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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