Troubleshooting Guide - Upright MX19 Service And Parts Manual

Troubleshooting
4.3 T
ROUBLESHOOTING
TROUBLE PROBABLE CAUSE
All functions 1. Blown electric motor fuse
inoperable,
electric motor
2. Faulty battery
does not start.
charger.
3. Faulty battery(ies).
4. Loose or broken
battery lead.
5. Emergency Stop
switch(es) failed open.
6. Blown control fuse
All functions 1. Oil level in hydraulic
inoperable.
reservoir is low.
Electric motor
starts when
2. Faulty hydraulic
control is
pump.
actuated.
1. Emergency
Platform will not
elevate or
Lowering valve
elevates slowly.
open.
2. Platform
overloaded.
3. Faulty controller at
upper controls.
4. Blown control fuse
5. Battery level low.
Check for fault code 68
Platform drifts 1. Emergency
down after being
lowering valve
elevated
open.
2. Leaking piston
seals in lift
cylinders
503727-002
G
UIDE
Check 160 amp electric motor fuse. Replace if blown.
Check the voltage output of the battery charger. If less than 24 VDC,
After completely charging batteries, test each battery. Replace as
Check continuity of all battery and motor leads. Replace if necessary.
With emergency stop switch in the ON position, check continuity
Check 7A circuit control fuse. Replace if blown.
Check hydraulic fluid level, top off as required.
Check pressure and delivery of the hydraulic pump. Replace if
Close emergency
down valve.
Observe maximum load rating. (see Operation section of this manual)
Check functionality of controller. Replace if faulty.
Check 7A circuit contrrol fuse. Replace if blown.
Check Battery Voltage. Charge if necessary.
Ensure that emergency lowering valve is completely closed. Replace
Check for leakage at cylinder return line, replace seals if necessary.

4.3 - Troubleshooting Guide

REMEDY
Page 4-3