Quick Answer
What is the Trimble GCS900?
See also: Leica MC1 Machine Control System
See also: Topcon 3D-MC Max Machine Control
The Trimble GCS900 is a GNSS-based grade control system for dozers and graders that uses the CB460 in-cab display and MC-R3 GNSS receiver to achieve 10–20mm 3D blade accuracy.
Trimble GCS900 — Complete Specs, Manual & Guide
Category: Machine Control | Brand: Trimble | Model: GCS900
The Trimble GCS900 Grade Control System is Trimble's flagship machine control platform for earthmoving. Using GNSS positioning with optional UHF radio or SNR base station, the GCS900 delivers precise blade control for dozers, graders, and scrapers. The system pairs the rugged CB460 cab display with the dual-antenna MC-R3 GNSS receiver for full 3D heading and elevation control without mast rotation sensors.
Trimble GCS900 Full Specifications
| Horizontal accuracy (GNSS) | 10mm + 1ppm RMS with RTK |
| Vertical accuracy (GNSS) | 20mm RMS with RTK |
| GNSS update rate | 10Hz |
| GNSS constellations | GPS, GLONASS, Galileo, BeiDou |
| Display unit | CB460 — 7" sunlight-readable touchscreen |
| GNSS receiver | MC-R3 dual-antenna receiver |
| Radio link | UHF 450–470 MHz, up to 3km range |
| Grade sensor | MS975 mast-mounted dual-axis cross-fall sensor |
| Operating voltage | 10–30VDC |
| Operating temperature | -40°C to +65°C |
| IP rating | IP67 (MC-R3 receiver) |
Accessories & Part Numbers
- CB460 display — In-cab 7" touchscreen controller
- MC-R3 receiver — Dual-antenna GNSS receiver for machine roof mount
- MS975 grade sensor — Dual-axis cross-fall and slope sensor
- SNR941 grade rod — Machine-mounted laser receiver for laser/GNSS hybrid
- GCS900 base station kit — UHF base transmitter for RTK corrections
Error Codes Quick Reference
| ERR001 | No GNSS correction source — check base station or NTRIP connection |
| ERR002 | GNSS float solution — insufficient satellites for RTK fixed |
| ERR010 | Grade sensor fault — inspect MS975 cable and mounting |
| ERR020 | Design surface not loaded — reload design from office software |
| ERR030 | Base station radio link lost — check UHF antenna and base power |
Frequently Asked Questions — Trimble GCS900
What accuracy does the Trimble GCS900 achieve?
The GCS900 achieves 10mm horizontal and 20mm vertical accuracy with RTK corrections from a Trimble GNSS base station. In laser augmentation mode with the SNR941 rod, vertical accuracy improves to 3mm for finish grading on flat surfaces.
What machines is the Trimble GCS900 compatible with?
The GCS900 supports Cat, Komatsu, John Deere, Volvo, and Case dozers and motor graders. Machine-specific mounting kits and hydraulic valve harnesses are required. Trimble provides OEM integration packages for most common machines.
What is the difference between the GCS900 and the Trimble Earthworks system?
The GCS900 is Trimble's proven legacy platform using CB460 display and UHF radio. Trimble Earthworks is the next-generation system using a larger touchscreen display, integrated cellular data, and direct cloud connectivity. Both achieve similar field accuracy; Earthworks adds over-the-air updates and improved office connectivity.
How is design data loaded into the GCS900?
Design surfaces are prepared in Trimble Business Center or Siteworks and transferred to the CB460 display via USB drive or the Trimble Connected Community cloud. The system reads LandXML and Trimble native surface formats.
Related models: Leica MC1 | Topcon 3D-MC Max
Track your GCS900 calibration dates, service history, and field verification records with Gradelog's Equipment Registry. Free to start at gradelog.com.
