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GVM-VAC
www.gvm-vac.com
Service Section
5.3 Hydraulic Boom Troubleshooting Guide
BOOM WILL NOT GO UP
1.
Check the fluid level in the reservoir.
2. Using a test light make sure there is current at the outside solenoid post (item#2), this has a 4 gauge Red battery
cable attached. If no current is found check the battery condition and battery connections.
3. If there is current at this post, depress the "up" button (item# 3), while pressing the "up" button check for current
at the middle post (item# 1), it has a White wire attached. If there is current at the post (item# 1) the solenoid may
be defective. Run a jumper wire connecting #1 and #2. This will test the motor, bypassing the solenoid. If the
boom raises, the motor is okay (motor part# MP-08004) but the solenoid is bad and needs to be replaced. Sole-
noid part number is MP-17744.
4. If there is NO current at the post (item# 1) check the wiring between the switch and the solenoid. If the wiring
checks out okay, the switch is bad and needs to be replaced.
BOOM WILL NOT GO DOWN
1. Using a test light make sure there is current at the outside solenoid post (item#2), this has a 4 gauge Red battery
cable attached. If no current is found check the battery condition and battery connections.
2. Press and hold the "down" button (item# 4), take a test light and probe through the insulation and test for current
on the red wire at the valve (item #5).
3. If there is current, the valve is bad and need to be replaced. Valve part number is MP-19283.D. If there is NO
current, check the wiring between the switch and valve, especially any connections. If the wiring checks out
okay, the switch is bad and needs to be replaced.
Summary of Contents for GVM8000
Page 67: ...67 GVM VAC www gvm vac com Service Section 5 10 7 Trailer Plug Wiring Diagram ...
Page 68: ...68 GVM VAC www gvm vac com Service Section 5 10 8 Trailer Wiring Diagram ...
Page 69: ...69 GVM VAC www gvm vac com Service Section 5 10 9 Brake Wiring Harness ...
Page 71: ...71 GVM VAC www gvm vac com Service Section 5 10 11 Remote Throttle Clutch Wiring Harness ...
Page 92: ...92 GVM VAC www gvm vac com 7 5 Kraft Fluid Drive Group Optional Fluid Drive Coupler Optional ...