Need the factory specs for your compact excavator? All 325 pages of this Yanmar B37V Service Manual PDF (OEM #44399040) focus on getting your machine back to factory condition. Open to full hydraulic circuit schematics detailing control valve operations, a complete troubleshooting breakdown, and electrical system wiring diagrams. You get step-by-step teardown instructions for the swing motor, travel motor, and engine components. Confirm the V-belt tension deflection sits at 10 to 15mm, then lock down the cylinder head bolts to exactly 6.8 to 7.2 kgf·m. Your excavator is down and every hour costs money. Grab this bookmarked download on your tablet, walk straight to the shop floor, and get the job done right.
What's Inside This Yanmar B37V Manual
| System | Pages | Key Topics |
|---|---|---|
| B37V | 1 | Specifications, Machine Dimensions and Working Ranges, Lifting Capacities, Machine Performance, Engine, Hydraulic Equipment |
| General Cautions for Maintenance Work | 6-15 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 16-27 | Specifications, Machine Dimensions and Working Ranges (Canopy Type, Cabin Type), Component Weights, Lifting Capacities |
| Servicing Standards | 28-45 | Machine Performance, Engine, Undercarriage (Rubber Crawler Specifications, Steel Crawler Specifications, Common Specifications of Steel & Rubber Crawlers), Control Devices |
| Engine | 46-104 | Measurement |
| Hydraulic System | 105-141 | Outline (Control Valve Operation, Additional Operation of Control Valve), Hydraulic Circuit Schematic (Standard Specifications) |
| Hydraulic Equipment | 142-232 | 6-1 Hydraulic Pump, 6-2 Control Valve, 6-3 Pilot Valve, 6-4 Swing Motor, 6-5 Travel Motor |
| Adjustment and Repair | 233-282 | 7-1 Electric Equipment of the Machine, 7-2 Undercarriage, 7-3 Control, 7-4 Swing Bearing, 7-5 Hydraulic Equipment, 7-6 Cabin |
| Periodic Inspection and Servicing | 283-285 | List of Periodic Inspection and Servicing |
| Fuel，Lube Oil and Grease Recommended | 286-287 | Fuel，Lube Oil and Grease Recommended ｂｙ Yanmar |
| Troubleshooting | 288-323 | 10-1 Non-Breakdowns, 10-2 Troubleshooting |
| Reference Data | 324-325 | 11-1 Specifications for Attachment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Sprocket tightening torque | 8.0 to 10.0 kgf·m | p. 43 |
| Cylinder head bolt tightening torque | 6.8 to 7.2 (M9x1.25) kgf·m | p. 45 |
| O-ring to back ring clearance (swivel joint) | within 3% of the shaft dia. | p. 270 |
| V-belt tension deflection | 10 to 15mm | p. 50 |
| Engine Rated Output | 21.0 kW (28.5 PS) at 2300 rpm | p. 21 |
Yanmar B37V Common Problems This Manual Covers
Yanmar B37V excavator engine misfires under heavy load and blows white smoke from the exhaust p. 45
Inspect the cylinder head gasket for leaks. Remove the valve cover and verify the cylinder head bolts are torqued properly. Tighten the bolts to the specified 6.8 to 7.2 kgf·m as shown on page 45. Replace the gasket if compression is lost.
Manual Section: 4 EngineUpperstructure drifts during operation or the boom swing cannot be made smoothly under load p. 270
Check the swivel joint seals for excessive wear or bypassing fluid. Disassemble the joint and measure the O-ring to back ring clearance. Ensure the clearance is within 3% of the shaft dia. as detailed on page 270. Replace the seal ring if measurements exceed this limit.
Manual Section: 7 Adjustment and RepairTrack drive pulls weakly on one side or travel speed switching lags unexpectedly p. 43
Inspect the travel motor mounting and drive sprocket hardware for looseness or damage. Torque the track motor sprocket bolts to 8.0 to 10.0 kgf·m according to page 43. Test the travel motor operation carefully to verify the machine tracks straight under heavy load conditions.
Manual Section: 3 Servicing StandardsEngine overheats during continuous digging operations and the coolant temperature alarm activates suddenly p. 50
Verify the cooling fan drive system is operating correctly. Measure the V-belt tension deflection at the center of the longest span. Adjust the alternator position until the deflection is 10 to 15mm as specified on page 50. Inspect all coolant hoses and clamps for obvious leaks.
Manual Section: 4 EngineFrequently Asked Questions
What is the hydraulic pump pressure spec for a YANMAR B37V?
The system relief pressure for the YANMAR B37V is 210 kgf/cm². Circuit relief pressures vary by component; for example, the boom (bottom end) is 240 kgf/cm², while the blade (rod end) is 100 kgf/cm². These specifications are detailed in the technical data and pressure adjustment sections of the manual.
What are the replacement specifications for hydraulic hoses?
Hydraulic hose specifications include the hose material (e.g., rubber hose, plastic hose), type of hose (e.g., high pressure, middle pressure), hose diameter (inner and outer), hose length, and combination of fittings. For example, a high-pressure rubber hose with a 1/4" inner diameter has a working pressure of 210 kgf/cm².
What is the engine oil capacity for the YANMAR B37V?
The engine oil capacity for the YANMAR B37V is 3.6 liters when using SAE 10W30 or 15W40 CD class oil. The manual notes that the numeral in parentheses indicates the total oil amount when the oil filter is replaced.
How do I check and adjust the V-belt tension on the YANMAR B37V?
To check the V-belt tension, push the center of the V-belt between the alternator and cooling water pump with a finger. If the deflection is 10 to 15mm, the V-belt tension is acceptable. If the tension is not within this range, adjust it using the adjuster at the alternator.
What is the standard fuel injection pressure for the YANMAR B37V?
The standard fuel injection pressure for the YANMAR B37V is 200 kgf/cm². This pressure can be adjusted by increasing the pressure adjusting shim thickness; for instance, increasing the shim thickness by 0.1 mm will increase the injection pressure by approximately 19 kgf/cm².
What is the procedure for checking the cooling system for water leakage on the YANMAR B37V?
To check for water leakage, first supply cooling water up to the normal level in the radiator, then attach a cap tester to the radiator. Start the cooling water pump and set the cap tester to a pressure of 0.75 to 1.05 kgf/cm². A reading lower than this range indicates water leakage from the cooling system.
What are the periodic inspection intervals for the fuel filter element on the YANMAR B37V?
The fuel filter element on the YANMAR B37V should be replaced every 250 hours as part of the periodic inspection and servicing schedule. This ensures proper fuel system function and prevents issues.
What are the valve head clearance specifications for the YANMAR B37V engine?
The valve head clearance specifications for the YANMAR B37V engine are detailed in section 3-2 "Engine". For example, the intake valve stem outside diameter is 7.995 to 7.975 mm, and the oil clearance for the intake valve is 0.035 to 0.070 mm. These values are critical for proper engine operation.
Document Quality
This document is a scanned PDF, so the text is image-only, meaning you cannot search or copy the content. The text is generally clear and readable, though some pages show minor blurriness. Diagrams and illustrations are raster images, but their labels are legible. Pages are mostly clean, but you will find black circles from hole punches, occasional slight skewing, and several blank pages throughout the manual.
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