OEM #913251 covers one machine and nothing else: your 634 Telehandler, across 310 pages. The electrical section walks the starter, park brake, and steering mode circuits through troubleshooting, while the hydraulic schematics include the main control valve pressure relief test and adjustment. Turn to the hydraulic chapter for system testing specs and cylinder repair sequences on every boom cylinder, lift through extend, followed by 25 pages on engine removal and installation. Set the rear axle wheel nuts to 450 ft.-lbs. (610 Nm) and check that the housing bell bolts read 40-45 lb.-ft. (54-61 Nm) before final assembly. Every idle hour costs you. Download it, search any spec by keyword, bookmark the sections you keep returning to, and get back under the boom.
What's Inside This Mustang 634 Manual
| System | Pages | Key Topics |
|---|---|---|
| Personal Safety Information and Decal Locations | 6 | Safety Rules and Reminders, Modifications, Nameplates, Markings and Load Capacities, Roll-Over Protective Structure (ROPS), Protect the Environment, Decal Locations |
| General Information and Specifications | 18 | Sae Fastener Torque Chart, Metric Fastener (Iso) Torque Chart, Standard Torque Data for Hydraulic Tubes and Fittings, Indicator and Operation Symbols, Fluid Capacities and Types |
| Engine Removal and Installation | 30-57 | Engine Removal, Relieve Hydraulic Oil Pressure, Engine Installation, General Information |
| Electrical Schematics, Troubleshooting Testing & Adjustment Procedures | 58-81 | Starter Circuit Troubleshooting, Park Brake Circuit Troubleshooting, Steering Mode Circuit Troubleshooting, Instrument Panel or Panel Bulb Replacement, Electrical Schematics |
| Battery Removal and Installation | 82-89 | Battery Removal, Battery Installation |
| Steering Control Valve Removal and Installation | 90-97 | Steering Control Valve Removal, Steering Control Valve Installation |
| Transmission Removal and Installation | 98-121 | Transmission Removal, Transmission Installation |
| Rear Axle Removal and Installation | 122-133 | Rear Axle Removal, Rear Axle Installation, Release Hydraulic Oil Pressure, General Information |
| Front Axle Removal and Installation | 134-145 | Front Axle Removal, Relieving Hydraulic Pressure, Front Axle Installation, General Information |
| Hydraulic Schematics, Troubleshooting Testing & Adjustment Procedures | 146-189 | Hydraulic Specifications, Troubleshooting, Hydraulic Schematics, Hydraulic System Testing, Main Control Valve Pressure Relief Test and Adjustment |
| Hydraulic Pump Removal and Installation | 190-197 | Hydraulic Pump Removal, Hydraulic Pump Installation |
| Frame Leveling Cylinder Removal and Installation | 198-205 | Relieving Hydraulic Pressure for the Frame Leveling Cylinder, Frame Leveling Cylinder Removal, Frame Leveling Cylinder Installation |
| Tilt Cylinder Removal and Installation | 206-213 | Tilt Cylinder Removal, Tilt Cylinder Installation, Relieving Hydraulic Pressure for the Tilt Cylinder |
| Hydraulic Cylinder Repair | 214-225 | Cylinder Disassembly, Cylinder Assembly, General Information |
| Slave Cylinder Removal and Installation | 226-233 | Relieving Hydraulic Pressure for the Slave Cylinder, Slave Cylinder Removal, Slave Cylinder Installation |
| Lift Cylinder Removal and Installation | 234-241 | Relieving Hydraulic Pressure for the Lift Cylinder, Lift Cylinder Removal, Lift Cylinder Installation |
| Boom Extend Cylinder Removal and Installation | 242-249 | Relieving Hydraulic Pressure for the Extend Cylinder, Extend Cylinder Removal, Extend Cylinder Installation |
| Boom Assembly Removal and Installation | 250-261 | Boom Assembly Removal, Boom Assembly Installation, Release Hydraulic Oil Pressure, Relieving Hydraulic Pressure for the Tilt Cylinder, General Information |
| Single and Double Leaf Chain Adjustment | 262-265 | Leaf Chain Adjustment, Leaf Chain Maintenance, General Information |
| Inner Boom Section Removal and Installation | 266-281 | Relieving Hydraulic Pressure for the Boom Extend Cylinder, Inner Boom Removal, Inner Boom Installation, Relieving Hydraulic Pressure for the Tilt Cylinder, General Information |
| Telescoping Boom Double Chain and Roller Bearing Replacement | 282-289 | Double Chain Roller Bearing Removal, Double Chain Roller Bearing Installation |
| Telescoping Boom Single Chain and | 290-297 | Removal, Installation, Single Chain Roller Bearing Replacement |
| Intermediate Boom Section Removal and Installation | 298-310 | Intermediate Boom Removal, Intermediate Boom Installation, General Information |
Every system also includes mandatory safety shutdown procedure.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Housing bell bolts torque | 40 to 45 lb.-ft. (54 to 61 Nm) | p. 44 |
| Wheel nuts torque (Rear Axle) | 450 ft.-lbs. (610 Nm) | p. 128 |
| Wheel nuts torque (Front Axle) | 450 ft.-lbs. (610 Nm) | p. 141 |
| Recommended Tire Type | 15.00 x 19.5 12-ply, 405/70 R20 x M27 Traction Type | p. 27 |
| Ground Clearance | 14” (356 mm) | p. 27 |
| Hydraulic tube nuts torque (1/2 inch tubing) | 35 to 40 LB FT (47 to 54 Nm) | p. 21 |
| Hydraulic Filter Type | Remote, 10 Micron, Replaceable Element | p. 25 |
| Hydraulic Filter Rated Flow | 100 GPM (379 L/min) | p. 25 |
| Boom lift pressure (target) | 3000 psi (207 bar) | p. 153 |
| Engine Crankcase Capacity (with filter) 4045T (John Deere) | 14.0 qts. (13.3 L) | p. 23 |
| Cooling System Capacity | 17.2 qts. (16.3 L) | p. 23 |
| Transmission Oil Capacity (with cooler) | 24 qts. (22.7 L) | p. 23 |
Mustang 634 Common Problems This Manual Covers
Mustang 634 boom won't lift or moves slowly under load, hydraulic pump whines p. 153
Check the hydraulic fluid level first; the reservoir holds 35 gal. (133 L). The 10-micron filter shouldn't be bypassing (bypass opens at 25 PSI / 172 kPa), and a bypass means a clogged element. Scan every hose connection for external weeping, then work through the boom lift troubleshooting on page 153. Target system pressure is 3000 PSI (207 bar) at the main relief.
Manual Section: Boom Lift TroubleshootingEngine won't start or turns over slowly in cold weather p. 60
Confirm the battery terminals are clean and tight; loose connections are the most common cold-start culprit on this machine. Check the fuel level (the tank holds 29 gal. / 110 L) and make sure the fuel filter isn't restricted. Then follow the starter circuit troubleshooting on page 60 to test voltage drop across the circuit before condemning the starter.
Manual Section: Starter Circuit TroubleshootingInstrument panel lights out, machine responds intermittently or not at all p. 82
Inspect the battery terminals and ground connections for corrosion before chasing wiring. Remove and clean the battery per the procedure on page 82, then load-test to confirm it holds charge. Trace the wiring diagram on page 67 to isolate open circuits; most intermittent faults come back to a corroded ground stud or a frayed harness connector near the cab floor.
Manual Section: Battery Removal and InstallationBoom extends unevenly or stops mid-stroke under load p. 242
Examine the extend cylinder for seal weeping at the rod end before assuming a pump fault. After any hose swap, torque the 1/2-inch hydraulic tube nuts to 35-40 LB FT (47-54 Nm) per page 21. A cylinder that drifts or stops short under load usually needs a rebuild: pull it and follow the disassembly procedure on page 214, where piston and wiper seals are the usual culprits.
Manual Section: Boom Extend Cylinder Removal and InstallationPark brake won't hold on grades or releases unexpectedly during travel p. 60
Trace the park brake circuit on the wiring diagram on page 67 to confirm the solenoid circuits are intact. Check the hydraulic connections at the brake actuator for weeping. If the brake slips under load, measure main system pressure against the spec on page 25; it should read 3000 PSI (207 bar), and a low reading points to a pilot pressure fault upstream.
Manual Section: Electrical Schematics, Troubleshooting Testing & Adjustment ProceduresFrequently Asked Questions
What are the torque specs for Mustang 634 wheel nuts?
Rear axle wheel nuts torque to 450 ft.-lbs. (610 Nm) during installation. The front axle uses the same figure: tighten its wheel nuts to 450 ft.-lbs. (610 Nm).
Torque specs for Mustang 634 service manual
Both SAE and Metric (ISO) fastener torque charts are included. They list minimum and maximum values in LB FT and Nm across bolt sizes and grades (SAE Grade No. 2, 5, 8* and ISO Grade No. 8.8, 10.9, 12.9). A 1/4 inch SAE Grade 2 bolt, for instance, torques to 5-6 LB FT (7-8 Nm).
What are the replacement specifications for tires?
The Mustang 634 Telehandler calls for 15.00 x 19.5 12-ply, 405/70 R20 x M27 Traction Type tires. That figure assumes the standard machine with listed tires, a 48" (1.2 m) masonry carriage, and 48" (1.2 m) pallet forks.
How quickly can I access this Mustang 634 manual after buying?
The 310-page searchable PDF downloads instantly after checkout. Open it on a laptop, tablet, or phone and bring it straight to the shop floor.
Are there any print restrictions on this Mustang 634 manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Are hydraulic system diagrams in this Mustang 634 Service Manual?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Mustang 634.
Document Quality
This document is a scanned PDF with an OCR text layer, allowing you to search and copy text throughout the manual. The text is crisp and consistently easy to read on all pages. Diagrams and illustrations are primarily raster images (photos), but labels and details within them are clear and legible. Most pages are clean, though there are numerous blank pages interspersed throughout the manual, which primarily serve as section breaks or filler.
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