Built around OEM #50940111 Revision A, this 584-page Gehl Z45/450Z Service Manual stays on one machine: your compact excavator, from engine cold-start to final torque check. It carries full hydraulic circuit schematics for both quick-coupler and standard setups, wiring diagrams that map the monitor and alarm electrical layout, and 100 pages of hydraulic equipment procedures across the pump, control valve, pilot valve, swing motor, and travel motor. Troubleshooting runs 16 pages, with symptom-by-symptom charts for cylinder drift, travel deviation, and swing faults. Torquing the M16 swing bearing bolts? Factory spec is 195.3 to 224.2 ft·lbf; track motor M14 bolts get 86.8 to 108.5 ft·lbf. No more digging through forums for numbers someone guessed at. Every page is bookmarked and keyword-searchable, so you find the right section before your knees hit the ground.
What's Inside This Gehl Z45/450Z Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 11-23 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 24-39 | Specifications, Outline Drawing and Working Area (Canopy Type, Cabin Type), Weight List of Main Parts, Lifting Capacity List |
| Engine | 61-138 | General (How to Read This Manual, Engine External Views, Structural Description, Exhaust Gas Emission Regulation) |
| Hydraulic System | 139-182 | Outline (Control Valve Operation, Additional Operation of Control Valve), Hydraulic Circuit Schematic (Quick Coupler, W/O Quick Coupler) |
| Hydraulic Equipment | 183-450 | Hydraulic Pump, Control Valve, Pilot Valve, Swing Motor, Travel Motor, Blade Control Pilot Valve, Solenoid Valve for P.T.O. Operation, Pilot Check Valve (for Quick Coupler Circuit) |
| Adjustment and Repair | 451-527 | Electric Equipment of Machine (Parts Layout of Electrical Equipment, Monitor and Alarm Systems, Wiring Diagram, Circuit Description of Engine Start and Stop, And Battery Charging, Removal and Reinstallation of Engine, Removal and Reassembly of Starter Motor, Removal and Reassembly of Drive Belts for Generator and Compressor) |
| Periodic Inspection and Servicing | 528-531 | List of Periodic Inspection and Servicing |
| Fuel, Lube Oil and Grease Recommended | 532-535 | Fuel, Engine Oil, Hydraulic Oil, Travel Reduction Gear Oil, Grease, Antifreeze |
| Troubleshooting | 536-576 | Non-Breakdowns (Natural Release of Bucket, Discontinuous Arm Movement, Drifting of Upperstructure on Quick Travel Operation, Thermal Shock of Travel Motor, Elongation of Boom Swing Cylinder on 70 Degrees Swing, Telescopic Motion of Boom Swing Cylinder with Lock Lever Set to Lock Position, Time Lag on Travel Speed Switching, Fluctuation in Oil Level of Hydraulic Oil Tank Due to Temperature Change, Operation of Quick Coupler Cylinder) |
| Reference Data | 577-584 | Dimensions and Specifications for Attachment (Z45/450Z, Dimensions Table, Oil Pressure Specifications Table, Bucket Teeth) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Travel motor × Track frame (M14) tightening torque | 86.8 to 108.5 ft·lbf (117.7 to 147.1 N·m) | p. 58 |
| Swing bearing × Lower frame (M16) tightening torque | 195.3 to 224.2 ft·lbf (264.8 to 304.0 N·m) | p. 58 |
| Starter motor nominal output | 2.3 kW | p. 133 |
| Starter motor brush wear limit | 0.35 (9.0) in. (mm) | p. 133 |
| Battery voltage - 5 hrs rate capacity | 12-72 V-Ah | p. 33 |
| Battery electrolyte specific gravity (100% charge) | 1.260 | p. 89 |
| General seal replacement instruction | Replace with new ones whenever disassembled or damaged | p. 15 |
| Rubber hose (High pressure type, SAE J517, 100R1) 02 inner diameter | 0.25 (6.3) in. (mm) | p. 19 |
| Rubber hose (High pressure type, SAE J517, 100R1) 02 working pressure | 2489 (17.2) PSI (MPa) | p. 19 |
| Fuel filter filtration area | 310 (2000) sq.in. (sq.cm) | p. 32 |
| Hydraulic oil tank suction filter filtration accuracy | 150 Meshes | p. 29 |
| Rubber track shoe width | 13.8 (350) in. (mm) | p. 30 |
Gehl Z45/450Z Common Problems This Manual Covers
Engine won't start or cranks slowly, starter motor spins weakly or not at all p. 547
Test the battery electrolyte specific gravity first; a fully charged pack reads 1.260 (page 89). Clean and tighten every terminal connection, then load-test voltage. If the starter still won't engage, pull it and measure brush length, replacing any worn past 0.35 in. (9.0 mm). Trace the start circuit with the flowchart on page 547.
Manual Section: General Machine & Engine Troubleshooting (Flowcharts)Hydraulic functions slow down, bucket won't reach full digging force, implements respond sluggishly
Verify hydraulic oil level first; total tank capacity is 64 L (page 29) and running low triggers cavitation before any visible leak appears. If level is correct, measure system relief pressure at the test port; spec is 3128 PSI (page 27). Inspect all hoses and fittings for seepage, then trace the affected circuit on the hydraulic schematic at page 147.
Manual Section: Hydraulic Pump TroubleshootingEngine temperature climbs into the red, coolant warning lamp activates during normal work cycles
Inspect the coolant reservoir level; at just 0.4 L total capacity (page 76), a small leak drops it fast. Confirm the radiator cap holds 12.8 PSI (page 32), since a weak cap lowers the boiling point under load. Clear debris from the radiator core and set fan belt tension to 72.3 lbf (page 77) before pulling the thermostat.
Manual Section: Engine Troubleshooting (General)Tracks sag excessively or ride too tight, machine drifts to one side on level ground p. 473
Measure rubber track sag at the midpoint; clearance should be 8 to 13 mm (page 473). Adjust through the tensioning fitting in small steps and recheck. With the track relaxed, inspect all rollers and the idler for flat spots and leaking seals. Retorque travel motor mounting bolts to 86.8 to 108.5 ft·lbf (page 58) if loosened.
Manual Section: Adjustment and RepairSwing bearing, bucket pins, or arm linkages squeal and bind during operation p. 530
Work through every grease point in the maintenance schedule (page 530); pins, bushings, bucket linkage, and slew bearing all have defined service intervals. Under-greasing accelerates metal contact; over-packing a sealed joint blows the lip seal. If looseness appears in the upperstructure, inspect swing bearing mounting bolts and torque to 195.3 to 224.2 ft·lbf (page 58).
Manual Section: Periodic Inspection and ServicingFrequently Asked Questions
What are the replacement specifications for starter motor?
Starter motor model S13-332 puts out 2.3 kW and weighs 11.7 lbs (5.3 kg). On reinstall, torque the M12 installation bolt to 57.9 to 72.3 ft·lbf (78.5 to 98.1 N·m).
What are the replacement specifications for battery?
Battery type is 115D31R: 12 V with a 5-hour rate capacity of 72 V-Ah. At full charge, electrolyte specific gravity reads 1.260 at 68°F (20°C).
How quickly can I access this Gehl Z45/450Z manual after buying?
Download lands instantly. The full 584-page searchable Service Manual is yours the moment payment clears, ready on a laptop, tablet, or phone right in the shop.
Can I print specific sections of this Gehl Z45/450Z Service Manual?
Yes. The PDF carries no DRM restrictions, so print any page or section your shop needs. It works with any standard printer.
Are there hydraulic schematics in this Gehl Z45/450Z manual?
Yes. Complete hydraulic schematics are included, with flow diagrams, valve configurations, and pressure specifications.
Document Quality
This document is a scanned PDF, but an OCR layer has been applied, so you can search and copy the full text. The text is generally crisp and easy to read throughout the manual. Diagrams and illustrations are raster images, meaning they may show some pixelation if you zoom in very closely, but their labels remain readable. Pages are mostly clean, though some exhibit slight skewing, which is common for scanned materials. There are no notable blank or filler pages beyond the main cover and chapter title pages.
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