Hydraulics drive the Gehl 1648 Plus asphalt paver's hydrostatic travel, hopper floor, feed augers and screed lift, and this 84-page Gehl 1648 Plus operator manual PDF (Form No. 918218) gives you the hydraulic and electrical schematics next to its controls, safety, operation and lubrication chapters. Troubleshooting charts fill a solid stretch near the back, tracing mat defects, material-delivery problems, drive valves, pump and motor faults and cylinder issues to their likely causes. Service intervals run from 10-hour daily checks to the 1000-hour hydraulic oil and strainer change, and a closing torque table covers Grade 2, 5, 8 and 8.8 fasteners. Expect the hydrostatic drive pump to relieve at 3500 psi (241 bar) and the auger pump at 2000 psi (138 bar); the reservoir takes 20 gal. (75.7 L). A made-up relief setting can burst a hose under a full hopper. Bookmarks and a searchable text layer land you on the chapter you want in seconds.
What's Inside This Gehl 1648 Plus Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 9-12 | Model and Serial Number Information, Controls and Components Identification |
| Specifications | 13-16 | Dimensions Measures and Weights, Hydraulic System Specifications |
| Checklists | 17-20 | Pre-Delivery Checklist |
| Safety | 21-28 | Mandatory Safety Shutdown Procedure, Safety Reminders, Pre-Operation Safety Reminders, Operation Safety Reminders, Service Safety Reminders, Screed Propane Heater Safety Reminders |
| Indicators and Controls | 29-40 | Guards and Shields |
| Maintenance | 41-44 | Maintenance Interval Chart, Maintenance Log |
| Operation | 45-54 | First Time Operation, Stopping the Paver, Walk-Around Inspection, Hands-On Check (Using the Screed Propane Heater) |
| Lubrication | 55-56 | General Information, Grease Fitting Locations |
| Schematics | 57-60 | Hydraulic Schematic, Electrical Schematic |
| Service and Storage | 61-72 | Dealer Services (Engine Components, Hydraulic System Components, Electrical Components) |
| Troubleshooting | 73-78 | Engine, Paver-Related Mat Problems, Material-Delivery, Compaction-Related Mat Problems, Drive and Main Control Valves, Hydraulic Pump and Motors System, Hydraulic Cylinders |
| Decal Locations | 79-80 | General Information |
| Torque Specifications | 83-84 | Unified National Thread, Metric Coarse Thread, Grade 2, Grade 5, Grade 8, Grade 8.8 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Variable Hydrostatic Drive Pump - Maximum Relief Pressure | 3500 psi (241 bar) | p. 14 |
| Hydraulic Auger Drive Pump - Maximum Relief Pressure | 2000 psi (138 bar) | p. 14 |
| Engine Horsepower (net) @ Engine Speed | 48 (35.8 kW) @ 3000 rpm | p. 13 |
| Engine Oil Capacity | 7.8 qts. (7.4 L) | p. 13 |
| Hydraulic Reservoir Capacity | 20 gal. (75.7 L) | p. 15 |
| Fuel Tank Capacity | 12.5 gal. (47.3 L) | p. 15 |
| Hydraulic System Return Filter | 5 Micron | p. 14 |
| Torque Hubs Gear Oil Capacity (each hub) | 17 ounces (500 cc) | p. 55 |
| Engine Cooling System Capacity | 5.7 qts. (5.4 L) | p. 13 |
| Max. Engine Speed (with no load) | 3210±25 rpm | p. 13 |
Gehl 1648 Plus Common Problems This Manual Covers
Gehl 1648 Plus engine cranks but will not start, or starts then cuts out and runs rough
Check the fuel level first; the tank holds 12.5 gal. (47.3 L) per page 15. Then work through the cranks-but-no-start and cuts-out entries in the engine troubleshooting chart on page 73, one cause at a time. Before restarting, verify the engine oil level against the 7.8 qts. (7.4 L) capacity on page 13.
Manual Section: Engine Troubleshooting p. 73Engine overheats while paving with the screed and augers working under load
Check the coolant level only after the engine cools; the system holds 5.7 qts. (5.4 L) per page 13. Verify the engine oil is at its 7.8 qts. (7.4 L) fill. Then follow the overheating entry in the engine troubleshooting chart on page 73 and the service intervals on page 41.
Manual Section: Engine Troubleshooting p. 73Hydraulic system will not operate, runs loud, or responds slowly to acceleration and deceleration
Check the hydraulic oil level in the reservoir first; full capacity is 20 gal. (75.7 L) per page 15. Inspect the pump and motors for leaking oil, and verify the return filter is the 5 micron element specified on page 14. Then work through the pump and motors chart on page 77.
Manual Section: Hydraulic Pump and Motors System p. 77Hydraulic cylinder piston does not move smoothly, lacks power, or leaks oil externally
Inspect each cylinder for external oil leakage, then wipe it clean so a fresh leak will show. Check the hydraulic reservoir level before cycling the cylinder again. Follow the hydraulic cylinders chart on page 77 for low power and rough piston travel, and trace the circuit on the hydraulic schematic on page 58.
Manual Section: Hydraulic Cylinders p. 77Starter will not turn, battery discharges or will not charge, and charge indicator fails
Check the battery charge before anything else, because the starter and charging faults both depend on it. Follow the electrical system chart on page 78 for starter, battery discharge and charge indicator faults, then trace the circuit on the wiring diagram on page 59. Verify each indicator against the controls layout on page 29.
Manual Section: Electrical System p. 78Screed not hot enough before paving
Check the ports at the end of the screed first; if they are plugged, clear them. In cold or windy weather, use the screed propane heater while paving, as the General Operation Problem chart on page 74 directs. Read the propane heater safety reminders in the Safety section before lighting it.
Manual Section: General Operation Problem p. 74Frequently Asked Questions
How do you troubleshoot hydraulic problems on a Gehl 1648 Plus?
For hydraulic pump and motor issues, check the oil level, filter condition, and oil viscosity. If the system is loud, check for air in the system or a clogged suction filter. Detailed troubleshooting steps for hydraulic pump and motor systems are provided on page 77. p. 77
What are the torque specifications for a Gehl 1648 Plus?
Torque specifications for various hardware sizes and grades are listed in the table on page 83. For example, a 1/4-20 Grade 5 bolt has a dry torque of 9 ft-lbs and a lubed torque of 75 in-lbs. p. 83
What are the hydraulic filter replacement specifications for the Gehl 1648 Plus?
The hydraulic system uses a screw-on filter element (Gehl P/N 074830) and a reservoir sump strainer (Gehl P/N 128299). These should be replaced if contamination is detected or during scheduled maintenance intervals. p. 56
What is the engine oil capacity for the Gehl 1648 Plus?
The engine crankcase oil capacity is 7.8 quarts (7.4 liters). Use SAE 10W-30 or 15W-40 oil with an API-CD or higher service classification. p. 55
How often should the hydraulic filters be changed?
Hydraulic filter elements should be changed at the first 50 hours for a new paver, and then every 250 hours thereafter. p. 41
How quickly can I access this Gehl 1648 Plus manual after buying?
A single searchable PDF file of 84 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Is printing allowed for this Gehl 1648 Plus Operator Manual?
Yes. It prints from any PDF reader, so run off the pages you need for your own repair work.
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