Six machines, one factory reference: this 366-page Manitou Americas Service Manual (OEM #50940256) covers the Gehl R135, Gehl R150, and Gehl R165 alongside the Mustang 1350R, Mustang 1500R, and Mustang 1650R skid-steer loaders. Inside, you get hydraulic schematics for every drive configuration, from single-speed T-bar controls to two-speed joystick with Power-A-Tach, Hydraglide, and Self-Level options, plus chassis and ROPS wiring diagrams and dedicated Tier 4 and Interim Tier 4 engine electrical schematics. Add 100 pages of repair procedures and 12 pages of troubleshooting backed by fault code tables, and you have your complete shop reference. Wheel nuts seat at 244 Nm (180 lb.-ft.) and axle housing locknuts torque to 280 lbf-ft (380 Nm). No more chasing specs across three different forums. Download now, open it on your phone or tablet, and get back under the machine.
What's Inside This Manitou Americas Gehl R135 & variants Manual
| System | Pages | Key Topics |
|---|---|---|
| Two-Speed Drive (Option) | 61-326 | Low-Speed Range, High-Speed Range, Control Pad, High-Speed Indicator, Tire Size |
| Hydraulic Schematic – Models 135R/1350R | 327 | Straight Fitting, Tee Fitting, 90° Fitting, Mechanical Drive Pump, Drive Motor, Hose |
| Hydraulic Schematic – Models 135R/1350R with Power-A-Tach and Self-Level | 328 | Self-Level Valve, Power-A-Tach Valve, Straight Fitting, Locknut, Tube, P-Clamp |
| Hydraulic Schematic – Models 150R/1500R | 329 | Straight Fitting, 90° Fitting, Mechanical Drive Pump, Drive Motor, Hose, Tube |
| Hydraulic Schematic – Models 150R/1500R with Power-A-Tach, Hydraglide and Self-Level | 330 | Power-A-Tach Valve, Self-Level Valve, Hydraglide Manifold, Accumulator, Straight Fitting, Hose |
| Hydraulic Schematic – Models 165R/1650R with T-Bar or Hand/Foot Controls (Single-Speed) | 331 | Straight Fitting, Tee Fitting, Charge Tube, Tandem Pump, Drive Motor, Hose |
| Hydraulic Schematic – Models 165R/1650R with T-Bar or Hand/Foot Controls (Single-Speed) with Power-A-Tach, Hydraglide and Self-Level | 332 | Power-A-Tach Valve, Self-Level Bypass Valve, Hydraglide Manifold, Accumulator, Tandem Pump, Drive Motor |
| Hydraulic Schematic – Models 165R/1650R with T-Bar or Hand/Foot Controls (Two-Speed) | 333 | Two-Speed Valve, Tandem Pump, Drive Motor, Solenoid Valve, Straight Fitting, Hose |
| Hydraulic Schematic – Models 165R/1650R with T-Bar or Hand/Foot Controls (Two-Speed) with Power-A-Tach, Hydraglide and Self-Level | 334 | P.A.T. Cylinder, Lift Cylinder, 2 Speed Valve, Drive Motor, Manual Valve, Hydraglide Manifold |
| Hydraulic Schematic – Models 165R/1650R with Joystick Controls (Single-Speed) | 335 | P.A.T. Cylinder, Lift Cylinder, 2 Speed Valve, Drive Motor, Joystick Valve, Manual Valve |
| Hydraulic Schematic – Models 165R/1650R with Joystick Controls (Single-Speed) with Power-A-Tach, Hydraglide and Self-Level | 336 | P.A.T. Cylinder, Lift Cylinder, 2 Speed Valve, Drive Motor, Joystick Valve, Hydraglide Manifold |
| Hydraulic Schematic – Models 165R/1650R with Joystick Controls (Two-Speed) | 337 | Lift Cylinder, 2 Speed Valve, Drive Motor, Joystick Valve, Manual Valve, Aux. Pump |
| Hydraulic Schematic – Models 165R/1650R with Joystick Controls (Two-Speed) with Power-A-Tach, Hydraglide and Self-Level | 338 | P.A.T. Cylinder, Lift Cylinder, 2 Speed Valve, Drive Motor, Joystick Valve, Hydraglide Manifold |
| Electrical Schematic – Chassis | 339 | Main Control Unit, Fuel Sender, Backup Alarm, Hyd. Oil Filter, Speed Sensor, Main Relay |
| Electrical Schematic – Chassis (Continued) | 340 | Main Control Unit, Fuel Sender, Backup Alarm, Hyd. Oil Filter, Speed Sensor, Main Relay |
| Electrical Schematic – ROPS | 341-343 | J1939 Termination/Add on Connector, Control Keypad, Key Switch, Dome Light, Work Light, Hand Control Buttons |
| A.Electrical Schematic – Engine (Tier 4) | 344 | - |
| Electrical Schematic – Model R165 Engine (Interim Tier 4) | 345 | Battery, Alternator, Starter, Engine ECU, Fuel Pump, Glow Plugs |
| Electrical Schematic – Models R135/R150 Engine (Interim Tier 4) | 346-366 | Battery, Alternator, Starter, Engine ECU, Fuel Pump, Glow Plugs |
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 Gehl R135 & variants Common Problems This Manual Covers
Gehl R135 loses all drive power under load, machine won't travel in either direction p. 352
Check hydraulic fluid level and inspect the filter for restriction before anything else. With the engine running, verify main system pressure reaches 207 bar (page 352). If pressure is weak, inspect the charge pump and clean all suction screens. Low charge pressure or a seized drive motor are the two most common causes of complete travel failure.
Manual Section: Hydrostatic Drive System TroubleshootingLift arms move sluggishly, drift down at rest, or won't raise to full height p. 98
Inspect hydraulic fluid level first and top off if low. Check the hydraulic filter; replace it if you're past 500 hours (page 98), tightening 3/4 turn past gasket contact (page 115). With fluid and filter confirmed good, test lift cylinder rod seals for bypassing. If system pressure won't hold 207 bar under load, suspect a worn relief valve or control spool.
Manual Section: Hydraulic System TroubleshootingEngine turns over but won't fire, or shuts down immediately after starting p. 353
Verify battery voltage is at or above 12.6 V (page 353) and terminals are clean and tight. Confirm the seat safety switch is fully depressed and the lap bar is latched. If the engine fires then dies, pull the engine controller fault codes and inspect fuel filter condition; replace it every 250 hours (page 110) or sooner if contamination is suspected.
Manual Section: Engine TroubleshootingHydraulic fluid overheating quickly during work cycles, high temp warning indicator stays on p. 98
Check hydraulic fluid level and fill if low. Inspect the hydraulic filter; restriction is the top cause of overheating. Replace after the first 50 hours, then every 500 hours (page 98), tightening 3/4 turn past gasket contact (page 115). Clean the cooler core and verify fan operation and unrestricted airflow through the cooler.
Manual Section: Hydraulic System TroubleshootingMachine creeps forward or pulls left/right when drive controls are centered in neutral p. 352
Adjust neutral position on both hydrostatic pump controls individually. With the machine on level ground and drive controls released, verify neither track moves. If one side still creeps, inspect the pump neutral adjustment linkage and look for contamination in the drive circuit. Confirm main system pressure holds steady at 207 bar (page 352) with no unexpected bypass.
Manual Section: Hydrostatic Drive System TroubleshootingAuxiliary hydraulic functions weak or completely inoperative, attachment connected and couplers seated p. 78
Verify the hydraulic lockout is not engaged; press the lockout button to toggle auxiliary functions back on (page 78). Check that couplers are fully locked and not bypassing. Inspect the auxiliary hydraulic control valve and solenoid for fault codes. Confirm main system pressure is at 207 bar (page 352); low pressure here will kill attachment output before anything else.
Manual Section: Hydraulic System TroubleshootingFrequently Asked Questions
How do I toggle the hydraulic lockout on a Gehl R165?
The hydraulic lockout on a Gehl R165 can be toggled on or off using the hydraulics lock-out button (A, Fig. 62) on the control keypad. Pressing the button deactivates the attachment lift and tilt hydraulics, and pressing it again toggles the hydraulic function back on. This feature is used when driving on public roads to prevent inadvertent lift arm movement.
What are the replacement specifications for hydraulic filters?
The hydraulic oil filter should be changed after the first 50 hours of operation, and then every 500 hours thereafter. A general interval of 250 hours or every 6 months is also listed for checking and changing the filter.
What are the replacement specifications for engine air filter?
The engine air filter should be checked and replaced after every 250 hours of use, or every 6 months, or if the filter is damaged, oil- or soot-laden. The inner air cleaner element should be checked and changed if necessary.
What format is this Manitou Americas Gehl R135 & variants 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 Manitou Americas Gehl R135 & variants manual?
Yes. The PDF has no DRM restrictions — 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.
Document Quality
This document is a scanned PDF with an optical character recognition (OCR) layer, allowing you to search and copy the full text. The text is generally crisp and easy to read, though some larger headings show minor pixelation from the scanning process. Diagrams and illustrations are primarily raster images, which may pixelate when zoomed, but their labels and details remain discernible. Pages are clean with minimal scan artifacts or skewing, and several "NOTES" pages are included throughout the manual.
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