Bringing your Gehl R105 skid-steer loader back to factory numbers is the job the 202 pages of this Gehl R105 service manual PDF (Form No. 50950298) are written for, and they cover the same machine under its twin badge, the Mustang 1050R. Each badge gets its own hydrostatic/hydraulic schematic, and the electrical schematics cover both DPF and non-DPF wiring, including the ROPS/FOPS circuits. The hydrostatic, hydraulic, electrical and engine chapters each have a troubleshooting guide, and the engine section ends with Yanmar diagnostic trouble codes and DPF regeneration procedures. With a filter change, refill the crankcase with 7.6 US qts. (7,2 L), and torque the hydrostatic pump to flywheel housing cover screws to 80 ft-lbs (112 N·m). A made-up torque on that joint is how a pump flange cracks. The PDF is bookmarked by chapter and has a text layer, and its exploded component views let you identify the exact piece before you call the dealer, so you order the right part the first time.
What's Inside This Gehl R105, 1050R, Mustang 1050R Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 9-10 | Engine, Capacities, Electrical System, Hydraulic System, Tire Options, Buckets |
| Safety | 11-18 | Additional Safety Reminders, Signal Words, Mandatory Safety Shutdown Procedure, Lift Arm Support Device (Engagement, Disengagement), ROPS – Raising, ROPS – Lowering |
| Lubrication | 19-24 | Hydraulic Oil Reservoir, Crankcase Oil, Chaincases, Grease Fitting Locations, Cooling System Drain Procedure |
| Mainframe | 25-48 | Mainframe - DPF Models, Mainframe - Non-DPF Models, Engine Access Cover - Removal and Installation, Roll-Over and Falling Object Protective Structure Components - ROPS/FOPS |
| Wheel Drives | 49-54 | Wheel Drive Components, Drive Chain Adjustment, Axle Housing Assembly Removal and Installation, Drive Chain Removal and Installation |
| Controls | 55-68 | Control Locations - T-Bar and Hand/Foot, Foot Throttle and Lift Tilt Components - T-Bar - DPF Models, Foot Throttle and Lift Tilt Components - T-Bar - Non-DPF Models |
| Hydrostatic System | 69-82 | Hydrostatic Pump Assembly and Drive Motors, Hydrostatic Controls, Charge Pressure Test and Adjustment, Drive Motor Hot-Oil Shuttle Valve, Hydrostatic Pump Relief Valves |
| Hydraulic System | 83-116 | Hydraulics - Self Level Valve Components, Hydraulics - Standard Auxiliary Components, Hydraulics - Lift Arm Components, Hydraulics - Chassis Components - DPF Models |
| Electrical System | 117-148 | Operation - Instrument Panel - DPF Models, Operation - Instrument Panel - Non-DPF Models, Electrical Chassis Components - DPF Models, Electrical Chassis Components - Non-DPF Models |
| Engine | 149-186 | Engine Components and Engine Controls - DPF Models, Engine Components and Engine Controls - Non-DPF Models, Air Cleaner and Exhaust Components - DPF Models |
Every system also includes introduction.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Peak Torque (DPF Models) | 80 lbf-ft. (109 N•m) @ 1820 rpm | p. 9 |
| Peak Torque (Non-DPF Models) | 80 lbf-ft. (109 N•m) @ 1200 rpm | p. 9 |
| Engine Oil Capacity (w/ filter change) | 7.6 US qts. (7,2 L) | p. 9 |
| Chaincase Capacity (each) | 8.0 US qts. (7,6 L) | p. 9 |
| Hydraulic Reservoir Capacity | 8.0 US gal. (30 L) | p. 9 |
| Engine Coolant Capacity | 8.0 US qts. (7,6 L) | p. 9 |
| Hydraulic System Pressure | 2750 PSI (190 bar) | p. 9 |
| Axle Nut Torque (initial) | 100 ft.-lbs. (136 N•m) | p. 50 |
| Axle Nut Torque (final) | 30 ft.-lbs. (41 N•m) | p. 50 |
| Wheel Nut Torque | 120 ft-lbs. (163 N•m) | p. 51 |
| DPF Models | ||
| Fuel Tank Capacity (DPF Models) | 9.5 US gal. (36 L) | p. 9 |
| Non-DPF Models | ||
| Fuel Tank Capacity (Non-DPF Models) | 10.3 US gal. (39 L) | p. 9 |
Gehl R105, 1050R, Mustang 1050R Common Problems This Manual Covers
Gehl R105 / Mustang 1050R hydrostatic drive shows no response or sluggish acceleration when moving the drive controls
Test charge pressure before you condemn the pump; run the Charge Pressure Test and Adjustment procedure and correct it as the procedure directs. If charge checks good, work through the traction drive and sluggish acceleration steps in the hydrostatic Troubleshooting Guide on page 85, then inspect the hydrostatic pump relief valves and the drive motor hot-oil shuttle valve.
Manual Section: Hydrostatic System Troubleshooting p. 85Lift arms or bucket creep down under load with the lift/tilt controls released
Check the lift/tilt control cable adjustment first; a cable out of adjustment is a cheap fix to rule out. Then work the lift arm drift and bucket drift steps in Hydraulic System Troubleshooting, using the lift arm component views in the hydraulic section beginning on page 91. Engage the lift arm support device before you get under raised arms.
Manual Section: Hydraulic System Troubleshooting p. 83Auxiliary hydraulics give no flow to the attachment when the auxiliary control is engaged
Check the auxiliary hydraulics cable adjustment before you open any lines. Next, test the solenoid valve following the Hydraulic System Troubleshooting steps and trace the standard auxiliary components laid out in the hydraulic section starting on page 91. Compare your pressure readings against the 2750 PSI (190 bar) hydraulic system pressure listed on page 9.
Manual Section: Hydraulic System Troubleshooting p. 83Starter will not engage when cranking and the engine does not turn over at all
Check battery charging first, then work the starter engagement checks in the electrical system Troubleshooting Guide on page 130 and test the solenoids. Trace the starting circuit against the chassis electrical schematic. If the circuit checks good and the engine still will not turn over, move to the Engine Troubleshooting steps in the engine section beginning on page 157.
Manual Section: Electrical System Troubleshooting p. 130Yanmar engine sets a diagnostic trouble code and drops into a fault state
Record the exact code, then look it up in the Engine Diagnostic Trouble Codes table starting on page 187 to identify the fault state and its cause. Fix the cause before you clear the code. On DPF models, work from the DPF engine components and controls views, because DPF and non-DPF engine layouts differ.
Manual Section: Engine Diagnostic Trouble Codes (DTC) p. 187Hydrostatic system overheats or turns noisy during long days of loader work
Work through the overheating and system noise steps in the hydrostatic Troubleshooting Guide on page 85 before you replace parts. Inspect the drive motor hot-oil shuttle valve and the hydrostatic pump relief valves. Then run the Charge Pressure Test and Adjustment procedure and correct charge pressure if it is out.
Manual Section: Hydrostatic System Troubleshooting p. 85Frequently Asked Questions
How do I reset regeneration on a Gehl R105?
Stationary regeneration is required when the DPF soot filter needs cleaning. To proceed, park the machine in a safe, well-ventilated area, apply the parking brake, and ensure the engine coolant is above 140° F (60° C). Once all conditions are met, press and hold the button (Z) on the control keypad until the Stationary Regeneration In-Progress screen displays, which takes approximately 25-30 minutes. p. 149
What are the torque specifications for the wheel nuts on a Gehl R105?
The wheel nut torque specification for the Gehl R105 and Mustang 1050R is 120 ft-lbs. (163 N•m). p. 51
What is the engine oil capacity for the Gehl R105?
The Yanmar three-cylinder diesel engine crankcase has a capacity of 7.6 U.S. quarts (7,2 liters) including the filter change. p. 20
What is the service interval for changing the engine oil and filter on the Gehl R105?
Engine oil should be changed and the filter element replaced every 500 hours of service. p. 20
What is the correct hydraulic oil reservoir capacity on the Gehl R105?
The hydraulic oil reservoir has a capacity of 8.0 U.S. gallons (30 liters). p. 19
Do I get instant access to this Gehl R105 Service Manual?
Straight to your device: 202 pages of searchable Service Manual, downloadable the moment payment goes through.
Can I print this Gehl R105 manual?
Yes. Print a single page or a chapter for your own shop use, on letter or A4.
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