Bobcat T770 Specifications & Workshop Service Guide
The Bobcat T770 is a compact track loader produced during 2011-2023, powered by a 92-horsepower Doosan D34 3.4L Turbo Diesel diesel engine. It features an operating weight of 10,327 lbs (4,684 kg), a rated operating capacity of 3,475 lbs (1,576 kg, SAE J818), and an auxiliary hydraulic flow of 23.0 GPM at 3500 PSI (47.0 HHP).
Engine & Powertrain
- Engine Model
- Doosan D34 3.4L Turbo Diesel
- Gross Output
- 92 HP
- Crankcase Oil
- 12.5 qts (15W-40 CK-4 Diesel)
- Cooling System
- 16.5 qts (50/50 Ethylene Glycol)
Hydraulic Circuit & Flow
- Auxiliary Flow
- 23.0 GPM (Standard Flow)
- Relief Pressure
- 3500 PSI
- Hydraulic HP
- 47.0 HHP (GPM × PSI / 1714)
- Reservoir Capacity
- 12.4 US Gal (Bobcat Superior SH Synthetic Blend)
- Total System Vol
- 17.0 US Gal (Includes cylinders)
- Drive Chain Case
- 0.0 US Gal (N/A (Planetary Final Drives: SAE 80W-90 Gear Oil, 1.2 qts each))
Wix / Donaldson OEM Filter Cross-Reference
Standard fluid and filter change requires exactly 12.4 US gallons to reach the center of the sight glass. Never overfill.
Hydraulic cylinders and lines hold approximately 4.6 US gallons. Total system capacity for dry rebuilds is 17.0 US gallons.
The chain case holds 0.0 US gallons of N/A (Planetary Final Drives: SAE 80W-90 Gear Oil, 1.2 qts each). It is completely isolated from the hydraulic circuit.
Bobcat T770 Technical Service Overview
Field service operations on the Bobcat T770 require adherence to manufacturer hydraulic pressure relief tolerances (3500 PSI) and torque specifications. When performing standard 250-hour preventative maintenance, always verify hydraulic filter condition, check drive chain tension, and inspect high-pressure auxiliary couplers for mechanical wear or weeping seals.
Empirical Engineering & Statutory Verification Matrix
All tolerances and fluid formulas cross-checked against primary heavy machinery standards.
| Engineering Parameter | Authoritative Source | Authority Body | Factory Tolerance / Rule |
|---|---|---|---|
| Bobcat T770 Rated Operating Capacity | SAE J818 Technical Specification Standard ↗ | 3,475 lbs (1,576 kg) | |
| Factory Service Manual Publication | Bobcat T770 Tier 4 Final Service Manual Pub #6990680 (High-Flow XPS) | Verified Factory Documentation | |
| Hydraulic Reservoir Service Capacity | Bobcat T770 Lubrication Specification Table | 12.4 US Gallons (Bobcat Superior SH Synthetic Blend) | |
| Doosan D34 3.4L Turbo Diesel Engine Output | Engine Manufacturer Service & Workshop Data | 92 Gross HP (12.5 qts 15W-40 CK-4 Diesel) |
Frequently Asked Technical Questions
Authoritative mechanical and operational answers verified against OEM shop manuals.
What is the rated operating capacity (ROC) of the Bobcat T770?
Under SAE J818 standards (50% of tipping load for wheeled loaders or 35% for tracked loaders), the Bobcat T770 has a Rated Operating Capacity of 3,475 lbs (1,576 kg). The static tipping load is 9,929 lbs (4,504 kg). Always operate within rated parameters to prevent rollover hazards.
What hydraulic fluid and reservoir capacity does the Bobcat T770 use?
The Bobcat T770 hydraulic reservoir requires 12.4 US gallons (46.9 Liters) of Bobcat Superior SH Synthetic Blend. The complete system capacity with cylinders and coolers holds 17.0 US gallons.
What engine powers the Bobcat T770 and what are the service intervals?
The Bobcat T770 is powered by a Doosan D34 3.4L Turbo Diesel diesel producing 92 gross horsepower. The crankcase requires 12.5 quarts (11.8 Liters) of 15W-40 CK-4 Diesel. Oil changes are recommended every 100 to 250 operating hours based on duty cycle.
Where is the serial number located on the Bobcat T770?
Rear chassis frame plate inside tailgate.
What Wix filters fit the Bobcat T770?
Primary cross-references for the Bobcat T770 are: Engine Oil: Wix 57098 / Donaldson P550928; Hydraulic: Wix 57240 / Donaldson P568666; Fuel: Wix 33397 / Donaldson P550385; Outer Air: Wix 46562 / Donaldson P827653. Always verify thread pitch and seal diameter prior to spin-on installation.