Snorkel UL32 - PLATFORM LOWERING ISSUES

Page 4 - 3UL25/UL32/UL40
ISSUE PROBABLE CAUSE REMEDY
One or more, but not all
indicator lights fail to operate.
1. Indicator light damaged or
faulty
Replace indicator light.
2. Outrigger limit switch dam-
aged or faulty.
Replace switch.
3. Chassis harness damaged
or improperly connected.
Repair damage and ensure
proper connection.
Lift function inoperable. Electric
motor starts when control is
activated.
1. Emergency lowering valve
(V2) open.
Close valve.
2. Hydraulic reservoir low. Check hydraulic uid level and
top off as required.
3. Down valve (V2) stuck Check or replace down valve
(V2).
4. Relief valve (RV) out of ad-
justment or faulty.
Adjust the relief valve (RV). If
not adjustable, replace.
5. Lift valve (V1) faulty. Check or replace lift valve (V1).
6. Faulty hydraulic pump (P) Check pressure and delivery of
the hydraulic pump. Replace
pump if required.
Platform does not lower using
electrical switches. (Will
lower using emergency
lowering valve.)
1. Down valve solenoid (SOL1)
faulty.
Test for continuity across
solenoid. Repair or replace.
2. Electrical malfunction. Check all AC plugs and cords
used (AC only). Check power
output at wall outlet (AC only).
With each switch (S1, S2, S3,
S4 &S6) in the “on” position,
check continuity across the
contacts. If none, replace.
Platform does not lower or low-
ers very slowly.
1. Down orice (ORF) plugged. Remove and clean the down
orice check valve.
2. Down valve (V2) blocked or
stuck closed.
Check function/clear blockage
of down valve.
3. Mechanical interference Inspect mast assembly, correct
interference.
Platform continues to lower
when controls are released.
1. Down valve (V1) stuck open. Clean or replace down valve.
TROUBLESHOOTING
Table 4-1: Troubleshooting table.