Quick Answer
The Trimble GCS900 is the most widely deployed GPS machine control system in US highway and heavy civil construction — field-proven on dozers, motor graders, scrapers, and excavators for 2D and 3D grade control.
See also: Trimble ERR003 Error
See also: Trimble ERR002 Error
See also: Trimble ERR001 Error
Trimble GCS900 — Complete Specs & Guide
Category: Machine Control | Brand: Trimble
The Trimble GCS900 is the most widely deployed GPS machine control system in US highway and heavy civil construction — field-proven on dozers, motor graders, scrapers, and excavators for 2D and 3D grade control.
Full Specifications
| Position accuracy | ±25mm horizontal, ±20mm vertical (RTK GPS) |
| Update rate | 10 Hz standard, 20 Hz optional |
| GPS constellations | GPS + GLONASS |
| Correction formats | CMR, CMR+, RTCM |
| Display | TD-520, 5" color touchscreen, sunlight-readable |
| Machine types | Dozer, grader, scraper, excavator, compactor |
| IP rating | IP67 all components |
| Software | Trimble Earthworks (cloud), Site Positioning System (legacy) |
Accessories
- SNR910 — GNSS receiver for machine
- MS975 — Machine control GNSS receiver
- GS615 — Radio for base station link
- Cab display TD-520 — 5" sunlight-readable cab display
Common Error Codes
| ERR001 | No RTK fix — check base station and radio link |
| ERR005 | Radio disconnected — check antenna cable |
| ERR020 | Correction format mismatch — verify base/rover settings |
Why Buy From Express Tools
Express Tools is an authorized dealer for all major contractor equipment brands. Every unit ships with full manufacturer warranty, factory calibration, and genuine accessories. Our pricing is guaranteed authorized dealer pricing on in-stock items, with same-day shipping before 2PM Eastern.
Frequently Asked Questions
What is the Trimble GCS900 accuracy?
±25mm horizontal and ±20mm vertical under good RTK GPS conditions. This is sufficient for DOT subgrade tolerances and most highway earthwork specifications.
What machines does the GCS900 work on?
Dozers, motor graders, scrapers, excavators, and compactors from all major manufacturers. Installation requires brand-specific sensor mounting hardware.
What is the difference between GCS900 and Trimble Earthworks?
GCS900 is the legacy Trimble machine control platform. Earthworks is the newer platform with improved software, cloud connectivity, and better 3D surface handling. GCS900 hardware is still sold and supported; Earthworks is recommended for new installations.
Service and Support from Express Tools
Express Tools is an authorized dealer for this equipment brand — every unit ships with full manufacturer warranty and factory calibration certificate. Our team can assist with setup questions, compatibility verification, and warranty service coordination. Our pricing is guaranteed authorized dealer pricing on all in-stock items, with same-day shipping on orders placed before 2PM Eastern.
Professional field equipment requires periodic service to maintain accuracy. Express Tools coordinates factory service for all brands we carry — contact us when your equipment needs calibration verification or warranty repair, and we'll connect you with the fastest route to an authorized service center.
Track your Trimble GCS900 in Gradelog's Equipment Registry — calibration dates, service history, job assignments. Free to start.
