Pump Circuit - JLG 10VP Service And Maintenance Manual

• Battery voltage 24 volts. (Fully charge batteries)
• Key switch set to Platform .
STEP
1. At the pump motor, check for 24 volts at both ends of the battery
cable running from the main contactor to the pump case stud. (left
side)
PUMP CONTACTOR RELAY CIRCUIT
Check the connection of the ground cable (attached to 5/16" stud,
2.
left side) to the pump contactor, is tight and connected on other end
to B- at the right side battery.
3. Check the connection of the ground cable (other side) is tight and
connected to the pump case stud (center).
4. Check the Yel/Red, 2-6 wire connected to the positive post on the
pump case for tightness and 24 volt reading.
5. Check the Tan, 55-1 wire connected to both the Ground control
switch and the MC-1 box, X105 connector, pin 5 through the pump
contactor relay. Without any lift functions activated, it should show
24 volts, with a lift function activated it should show ground.
DUMP VALVE CIRCUIT
Check the Yel/Red, 2-6 wire connected to the positive (+) post on
6.
the pump case for 24 volts.
Check the Tan, 3-1 wire connected to both the Ground control
7.
switch and the MC-1 box, X105 connector, pin 4 through the lift up
valve. Without any lift function activated, it should show 24 volts,
with a lift function activated it should show ground.
DOWN VALVE CIRCUIT
Check the Yel/Red, 2-6 wire connected to the positive (+) post on
8.
the pump case for 24 volts.
9. Check the Tan, 4-1 wire connected to both the Ground control
switch and the MC-1 box, X105 connector, pin 6 through the lift
down valve. Without any lift functions, it should show 24 volts, with
a lift function it should show ground.
MAIN CONTACTOR CIRCUIT
10. Check the battery cable from the B+ (left side) battery for 24 volts.
Check the battery cable going out to the pump case (left side) stud
11.
for 24 volts.
Check the Yel/Red, 2-5 (10 ga.) wire to the MC-1 box, X101 connec-
12.
tor, pin A1 for 24 volts.
13. Check the Yel/Red, 2-4 wire to the Power Relay, pin #87 for 24
volts.
3120728
Table 3-21. Pump Circuit
ACTION
– JLG Lift –
SECTION 3 - TROUBLESHOOTING
SPEC YES
24 volts Go to Step 2
Ground Go to Step 3
Ground Go to Step 4
24 volts Go to Step 5
Ground Go to Step 6
24 volts Go to Step 7
24 volts Go to Step 8
24 volts Go to Step 9
24 volts Go to Step 10
24 volts Go to Step 11
24 volts Go to Step 12
24 volts Go to Step 13
24 volts Go to Step 14
NO
Tighten
Connection or
Replace Cable
if Necessary
Tighten
Connection or
Replace Cable
if Necessary
Tighten
Connection or
Replace Cable
if Necessary
Tighten/Repair
Connection
Tighten/Repair
Connection
Tighten/Repair
Connection
Tighten/Repair
Connection
Tighten/Repair
Connection
Tighten/Repair
Connection
Tighten/Repair
Connection
Tighten/Repair
Connection
Tighten/Repair
Connection
Tighten/Repair
Connection
3-31