Page 115
Speed Level Seres - Servce & Parts Manual
January 2019
Secton 8 - Troubleshootng - 3084RT Models
Problem
Possible Cause
Remedy/Solution
Platform will
not lower or
lowers slowly
Maintenance lock in maintenance position
Return maintenance lock to the stowed position
Lowering valve not energized
Check wiring to lowering valve located on Lift Cylinder
Lowering valve not shifting
Clean debris, check for damage, replace
Lowering orifice/s plugged
Clean orifice/s located inside hose fitting on lift cylinder
System interruption
Check HELP messages using EZ-Cal
Lowers but
not completely
Down valve on lift cylinder inoperative
Check lift valve coil
Emergency
lowering not
working
Lowering valve not shifting
Clean debris, check for damage, replace
Lowering orifice plugged
Clean orifice/s located inside hose fitting on the lift cylinder
E-down battery discharged
Charge, check charge diode & connections
Valve coil failed on cylinder
Test (6-8 ohms), replace
Drive
No drive
function
Lift/Drive select switch not in Drive position
or not operational
Select Drive position (upper control box), Check switch
Check switch position from GP400 with EZ-Cal (see EZ-Cal ID# 2b-2)
DLD
Drive valve not shifting (SVD1)
Check connections at valve
Check Drive Valve for contamination
Check Drive output from GP400 (See EZ-Cal chart ID# 2b-4 & 2b-5
also 2f1-4 & 2f-15)
Proportional Valve not shifting (SP1)
Check connections at valve
Check Proportional valve for contamination
Check proportional output from GP400 (see EZ-Cal ID# 2f-9 & 2b-3)
Drive system shut down (interlock)
Check HELP and MODE message on EZ-Cal
No drive
elevated
Unit out of level
Lower and operate Auto-level
System Interruption (interlock)
Check HELP messages using EZ-Cal
Slow drive
with platform
stowed
High torque enabled
Check Speed/Torque switch on upper controls
Malfunctioning rear wheel bypass valve
Located on rear wheel motors only
Check electrical by disconnecting valves
Check function by replacing valves
Wheel motors not functioning correctly
Inspect wheel motors for excessive bypass
Poor
gradeability
or drive
performance
High or mid speed enabled
Check Speed/Torque switch on upper controls
Batteries discharged
Check battery voltage with multi-meter or EZ-Cal
Clean, service, charge batteries
Wheel motors not functioning correctly
Inspect wheel motors for excessive bypass
Malfunctioning rear wheel bypass valve
Located on rear wheels only
Check electrical by disconnecting valves
Check function by replacing valves
Malfunctioning series parallel valves
Located on top of main hydraulic manifold PD1, PD2 & PD3
Remove and inspect
Incorrectly adjusted or worn hydraulic
pump
See Hydraulics section for pump adjustment
Inspect or replace pump
Drive in one
direction only
Drive valve SVD1 not energized in one
direction
Check 12 volts to appropriate coil
Check coil
Check valve function
Counterbalance valve CBV1 or CBV2 not
functioning correctly
Swap counterbalance valves to see if functioning direction changes
No output from GP400
Check switch position output from GP400 (see EZ-Cal ID# 4f-7
– FWD or 2f-9 – Reverse)
