This Service Manual covers the Manitou Americas skid-steer loaders sold as the Gehl R135, R150, and R165 and the Mustang 1350R, 1500R, and 1650R. It is the factory manual, publication number 50940256, running 366 pages, and it applies to machines powered by Yanmar 4TNV88 and 4TNV98 diesel engines in both DPF and non-DPF configurations.Inside you get the full hydraulic and electrical schematics, the two-speed drive option, service specifications, and step by step removal, testing, and adjustment procedures. Fluid capacities, system pressures, and torque values are called out so you can service the drive, lift, and attachment circuits correctly.Whether you are chasing a hydrostatic fault, tracing a wiring problem, or setting charge pressure, this PDF download gives an owner or independent mechanic the same reference the dealer uses.
What's Inside This Manitou Americas R-Series Skid Steers Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 11-18 | Indicator and Operation Symbols, Model Identification, Manual Use |
| Safety | 19-30 | - |
| Safety Equipment | 31-38 | Operator's Position, Rear Window Emergency Exit, Lift Arm Support, Seat Belt, ROPS/FOPS |
| Indicators and Controls | 39-70 | Control Keypad, Information Center Electronic Display, Status/Maintenance/Error Code Screens, Accessory Keypad, Optional Lights/Lockout Keypad |
| Operation | 71-94 | Pre-Operation Checks, Starting and Stopping, Checks During Operation, Jump-Starting, DPF Regeneration |
| Maintenance | 95-128 | Maintenance Schedules, Lubrication and Filter Changes, Maintenance Log, General Lubrication, Engine Air Cleaner, DPF Service |
| Hydrostatic System | 129-138 | Hydrostatic Components, Charge Pressure Test, Hydrostatic Pump Drive Coupling |
| Drive System | 139-152 | Wheel Drive Components, Axle Housing, Axle Installation, Drive Chain Removal/Installation |
| Controls | 153-166 | Drive System Mechanical Control Linkage, Hand/Foot Drive Control Linkage, T-Bar Drive Control Linkage |
| Hydraulic System | 167-200 | Chassis Hydraulics, Lift Arm Hydraulics, Auxiliary Hydraulics, Self-Leveling Hydraulics, Power-A-Tach Hydraulics |
| Electrical System | 201-236 | Fuses/Relays/Diodes, Relay Testing, Chassis Electrical, Engine Electrical, ROPS/FOPS Electrical, Heater/Wiper Electrical, Main Control Unit |
| Lift Arms and ROPS/FOPS | 237-266 | Lift Arm Bushing Replacement, Lift Arm Stop, Lift Cylinder, ROPS/FOPS Installation |
| Engine Removal & Installation (Tier 4) | 267-306 | Yanmar Tier 4 Engine Removal/Installation, DPF Service |
| Troubleshooting | 307-326 | Engine Troubleshooting, Indicator Lamp Troubleshooting, Hydraulic System Troubleshooting, Hydrostatic Drive Troubleshooting, Electrical Troubleshooting, Yanmar Engine Diagnostic Trouble Codes |
| Hydraulic Schematics | 327-338 | Hydraulic Schematics for R135/1350R, R150/1500R, R165/1650R (T-Bar, Hand/Foot, Joystick; Single/Two-Speed; Power-A-Tach, Self-Level, Hydraglide) |
| Electrical Schematics (Wiring) | 339-346 | Chassis Wiring, ROPS Wiring, Engine Wiring (Tier 4 and Interim Tier 4) |
| Specifications | 347-358 | Fluid Capacities/Lubricants, Engine Specifications, Coolant Mixtures, Travel Speeds, Dimensions, Pallet Forks, Optional Features |
| Index & Torque Specifications | 359-366 | Index, Torque Specifications, Hydraulic Fitting Torques |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Hydraulics Lock-out (Option) toggle | Pressing the button again will toggle hydraulic function back on | p. 78 |
| Hydraulic fittings (M14X1.5, Elastic seal) | 33 lb.-ft (45 Nm) | p. 363 |
| Hydraulic oil filter replacement interval | After first 50 hours of operation; every 500 hours thereafter | p. 98 |
| Hydraulic oil filter tightening | 3/4 of a rotation past the point where the gasket contacts the filter head | p. 115 |
| Engine air filter replacement interval | Every 250 hours of use, or every 6 months, or if damaged/oil- or soot-laden | p. 110 |
| Fuel filter replacement interval | Every 250 hours of operation | p. 110 |
| Fuel filter tightening | 3/4 rotation past the point where the gasket contacts the filter head | p. 110 |
| Gehl R135, Mustang 1350R | ||
| Lift arm pivot pin securing hardware torque | Not specified in manual for specific hardware, general tightening instructions apply | p. 247 |
| Gehl R150, Gehl R165, Mustang 1500R, Mustang 1650R | ||
| Wheel nut torque | 244 Nm (180 lb.-ft.) | p. 121 |
| Lift cylinder pivot pin securing hardware torque | Not specified in manual for specific hardware, general tightening instructions apply | p. 238 |
| Gehl R165, Mustang 1650R, Gehl R150, Mustang 1500R, Gehl R135 (SN FOE193365 and Up), Mustang 1350R (SN DOE187213 and Up) | ||
| Axle housing locknuts torque | 280 lbf-ft (380 Nm) | p. 143 |
| Gehl R135 (SN FOE193364 and Before), Mustang 1350R (SN DOE187212 and Before) | ||
| Axle shaft castle nut torque (initial) | 100 lb.-ft. (135 Nm) | p. 146 |
Manitou Americas R-Series Skid Steers Common Problems This Manual Covers
Loss of drive power under load
The loader stops traveling or feels weak when working under load. This usually traces to a drive pump, drive motor, low charge pressure, or contamination in the hydrostatic circuit shown in the drive schematics.
Manual Section: Hydraulic Schematic - Models 135R/1350R p. 327Lift arms drift down or raise slowly
The lift arms settle on their own or are slow to raise. Worn lift cylinders, a self-level valve fault, valve spool wear, or low hydraulic oil are the usual causes.
Manual Section: Hydraulic Schematic - Models 135R/1350R with Power-A-Tach and Self-Level p. 328Engine cranks but machine shuts down
The engine starts but the machine derates or shuts down. Check the safety interlock, the main relay, and the main control unit before condemning the engine, using the chassis wiring diagram.
Manual Section: Electrical Schematic - Chassis p. 339Hydraulic system overheats quickly
The hydraulics run hot or become noisy after only a short period of work. Low hydraulic oil, a clogged filter, a restricted cooler, or internal pump wear are common reasons.
Manual Section: Hydraulic Schematic - Models 150R/1500R p. 329Attachment functions weak or dead
Auxiliary attachment functions are weak or do not respond. The auxiliary valve, the Power-A-Tach circuit, a coupler fault, or a hydraulic supply problem should be checked against the schematic.
Manual Section: Hydraulic Schematic - Models 150R/1500R with Power-A-Tach, Hydraglide and Self-Level p. 330Machine creeps or steers unevenly
The loader creeps in neutral or pulls to one side. A hydrostatic drive imbalance, worn pumps or motors, or a two-speed drive fault can cause poor control response.
Manual Section: Two-Speed Drive (Option) p. 61Frequently Asked Questions
Which machines does this service manual cover?
It covers the Manitou Americas skid-steer loaders sold as the Gehl R135, R150, and R165 and the Mustang 1350R, 1500R, and 1650R, across DPF and non-DPF Yanmar engine builds.
Are wiring diagrams included?
Yes. The Electrical Schematic section provides chassis, ROPS, and engine wiring diagrams so you can trace circuits, relays, and sensors. p. 339
What is the main hydraulic system pressure?
The specifications list a main hydraulic system pressure of 207 bar for all models, with a charge and brake release pressure of 24 bar on the R135/1350R and R150/1500R. p. 352
How often should the fuel filter be changed?
The maintenance data calls for replacing the fuel filter every 250 hours of operation and tightening it three-quarters of a turn past gasket contact. p. 110
What format is this manual in?
Instant PDF download. You get the full 366-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this manual?
Yes. The PDF has no DRM restrictions, so you can print any page or section you need for your shop. Works with any standard printer.
Are hydraulic system diagrams in this Manitou Americas Gehl R135 & variants?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Manitou Americas Gehl R135 & variants.
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