GRAFF Repair Services India
GRAFF is a German manufacturer of high-precision hydraulic components, proportional valves, directional control systems, and industrial automation equipment. Established in 1958, GRAFF serves global industries including automotive, packaging, food processing, and heavy machinery. Their proportional and directional control valve technology is widely deployed across Indian manufacturing plants, particularly in automotive tier-1 suppliers and packaging machinery OEMs.
GRAFF is a German manufacturer of high-precision hydraulic components, proportional valves, directional control systems, and industrial automation equipment. Established in 1958, GRAFF serves global industries including automotive, packaging, food processing, and heavy machinery. Their proportional and directional control valve technology is widely deployed across Indian manufacturing plants, particularly in automotive tier-1 suppliers and packaging machinery OEMs.
Synchronics repairs the complete GRAFF industrial electronics and hydraulic control system portfolio — proportional directional control valves, proportional pressure reducers, servo valve controllers, and integrated hydraulic automation modules. Our 180+ engineers have extensive field experience diagnosing GRAFF proportional valve electronics failures, spool positioning errors, and closed-loop feedback system faults. Indian plant managers trust Synchronics for rapid GRAFF turnaround because we stock spares, maintain calibration equipment, and understand GRAFF's proportional spool dynamics intimately.
Deep expertise in GRAFF proportional valve electronics and closed-loop hydraulic automation system repair.
GRAFF Product Lines We Repair
Our engineers are trained on the full GRAFF product range. Below are the major product families we service.
GRAFF Proportional Directional Control Valves
4/3 and 3/3 proportional spool valves with integrated electronics, pilot-operated spools, and proportional solenoid actuators. Common issues include spool stiction, proportional coil burnout, feedback transducer drift, and proportional amplifier card failures causing loss of flow control.
GRAFF Proportional Pressure Reducers
Load-sensing proportional pressure control valves used in injection moulding and stamping systems. Faults include pilot solenoid malfunction, spool centering spring wear, and proportional amplifier signal loss affecting downstream pressure regulation.
GRAFF Servo Valve Controllers and Amplifiers
Closed-loop proportional valve driver electronics with PID feedback control, onboard diagnostics, and remote signal conditioning. Repair scope includes amplifier PCB faults, transducer interface circuit failures, and proportional coil impedance verification.
GRAFF Hydraulic Manifold Assemblies
Integrated sandwich-type manifold blocks combining proportional valves, counterbalance valves, and pilot-operated check valves. Common failures: internal leak paths due to poppet wear, proportional spool binding from contamination, and electronics interconnect corrosion.
GRAFF Position Feedback Transducers
LVDT and magnetostrictive linear position transducers integrated into GRAFF proportional valve spools for real-time closed-loop control. Issues include transducer cable breakage, core rod corrosion, and signal conditioning circuit failure causing null offset errors.
Why Choose Synchronics for GRAFF Repairs?
PCB-Level Expertise
We repair down to the component level — not just swap boards. Our engineers identify root causes, replace failed IGBTs, capacitors, processors, and gate drivers on GRAFF equipment.
Fast Turnaround
Standard 7–10 working days. Express 3–5 days available for critical breakdowns. Emergency same-day/next-day service for unplanned downtime.
6-Month Warranty
Every repaired unit ships with a 6-month comprehensive warranty on parts and labour. Our repair success rate is over 94% across all brands.
All-India Service
Couriered repairs accepted from any city in India. Doorstep pickup available in Vadodara, Mumbai, Pune, Ahmedabad, Surat, Chennai, and more.
Common GRAFF Equipment Faults We Fix
Based on 30+ years of repair data, these are the most frequent failure modes we see in GRAFF equipment arriving at our workshop.
- ✓Proportional solenoid coil open circuit or resistance drift — GRAFF proportional solenoid coils experience burnout from sustained high current draw, moisture ingress through cable glands, or thermal cycling in high-temperature injection moulding environments. Resistance drift reduces proportional spool response and causes flow control instability.
- ✓Proportional spool stiction and sluggish response — Hydraulic fluid contamination (particles >10 microns) or varnish buildup on GRAFF proportional spool lands causes mechanical drag. Fluid oxidation products deposit on spool surfaces, reducing proportional valve response time from <200ms to >500ms and degrading process control accuracy.
- ✓LVDT transducer signal dropout or null offset error — GRAFF integral LVDT position transducers fail due to cable insulation cracking at the solenoid connector, moisture contamination causing open secondary winding, or ferrous core rod corrosion. Signal loss causes closed-loop proportional valve to saturate and lose metering control.
- ✓Proportional amplifier PCB failure or gain loss — GRAFF proportional amplifier boards suffer electrolytic capacitor aging, solder joint fatigue on high-current output stages, and parasitic oscillation on the proportional coil drive circuit. Amplifier gain drift causes undersized proportional solenoid actuation and weak spool position feedback.
- ✓Manifold sandwich block internal leakage or cavity seal failure — GRAFF hydraulic manifold sandwich assemblies develop internal port-to-port leakage when cavity seals (O-rings or metal poppets) wear from sustained high pressure cycling. Leakage paths reduce proportional valve control accuracy and cause unexpected actuator drift in injection moulding or stamping cells.
- ✓Proportional valve hysteresis and non-linearity in flow control — GRAFF proportional valve spools develop hysteresis when internal pilot passages become partially blocked by fluid varnish or silt, or when proportional solenoid force linearity degrades due to coil wear. Hysteresis causes the valve to exhibit different flow response on opening vs closing, degrading part quality in automotive stamping and injection moulding.
How We Repair Your GRAFF Unit
Receive & Log
Your unit is logged into our tracking system with a unique job number. You receive WhatsApp / email updates at every stage.
Fault Diagnosis
Board-level diagnosis using oscilloscopes, LCR meters, and thermal cameras. Root cause identified before any repair begins.
Component Repair
Faulty ICs, capacitors, MOSFETs, IGBTs, and gate drivers replaced with genuine or equivalent-spec components.
Full-Load Test
Unit tested under rated load with original or equivalent motor. All parameters verified. 6-month warranty issued.
Industries Using GRAFF Equipment
We serve plant maintenance teams across all major industries where GRAFF automation is deployed.
Frequently Asked Questions — GRAFF Repairs
Do you repair GRAFF equipment anywhere in India?+
Yes. Synchronics repairs the full GRAFF proportional valve, manifold, servo amplifier, and transducer product range across India. We offer same-day PAN India door pickup from Mumbai, Delhi, Pune, Bangalore, Chennai, Hyderabad, Ahmedabad, Surat, and all tier-2 industrial cities via our courier network. All repairs happen at our certified facility in Vadodara, Gujarat.
What is your turnaround time for GRAFF proportional valve repair?+
Standard GRAFF proportional directional valve and proportional pressure reducer repairs are typically completed within 5-7 working days — solenoid coil testing, spool cleaning and inspection, transducer verification, proportional amplifier calibration, and full dynamic validation. Express service (48-72 hours) is available for critical production shutdowns. We maintain stock of common GRAFF proportional solenoid coils, LVDT transducers, and pilot-operated seals.
Do you calibrate GRAFF proportional amplifiers and servo valve controllers?+
Yes. Synchronics has precision test benches equipped to calibrate GRAFF proportional amplifier boards (EVA, MGA series) and servo valve controllers to factory specification. We measure amplifier gain, proportional coil drive linearity, feedback loop stability, and transducer null offset using calibrated function generators and oscilloscopes. All calibration work is documented on factory-format certificates.
Can you repair GRAFF manifold sandwich blocks with internal leakage?+
Yes. We disassemble GRAFF hydraulic manifold assemblies, identify cavity leak paths using pressure-test rigs, and replace worn poppets, O-rings, and counterbalance valve spools. Port surfaces are honed to factory finish tolerance; pilot passages are ultrasonically flushed. All manifolds are air-flow and pressure-tested to zero bypass before shipment.
What documentation do you provide after GRAFF equipment repair?+
Synchronics provides detailed repair reports including digital photos of original fault, component test results (megger, insulation, coil resistance), proportional valve response curves, amplifier calibration certificates, and serial number traceability. All GRAFF repair work is backed by 12-month parts and labour warranty. Reports are email-delivered in PDF format and archived in our ISO 9001 database.
How do I send my GRAFF unit for repair?+
Pack the unit securely and courier it to our Vadodara workshop. Include a note with the fault description and your contact details. We will log it into our system and WhatsApp you a job number within 24 hours of receipt. Doorstep pickup is available in Vadodara, Ahmedabad, Surat, Mumbai, and Pune.
What is the cost of repairing a GRAFF drive or PLC?+
Repair cost depends on the model and the fault. We offer a free diagnosis — once we identify the fault, we provide a fixed quotation before proceeding. Typical repairs cost 20–40% of the new unit price. We will never repair without your approval.
What warranty do you provide on GRAFF repairs?+
All repaired units carry a 6-month comprehensive warranty covering the same fault and related issues. If the fault recurs within the warranty period, we repair it free of cost.
Do you provide a no-fix, no-fee guarantee?+
Yes. If we cannot repair your GRAFF unit after diagnosis, you pay only the diagnosis fee (₹500–₹1,500 depending on the product). The unit is returned to you at no additional charge.
GRAFF Repair Catalog
No products found for GRAFF
Don't See Your GRAFF Model Listed?
We repair the full range of GRAFF industrial electronics — even if the specific model is not yet in our catalog. Send us the unit details and we'll confirm repairability within 24 hours.
Free evaluation • 6-month warranty • PAN India pickup
Get Your Equipment
Back in Action — Fast
Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
Free Evaluation
No obligation
48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Pickup
Doorstep service