5 troubleshooting section - table of contents, Ohm ratings for various components 3-12, Main power circuit troubleshooting – JLG 15VPSP Service Manual User Manual
Page 65: Unit will not power up from ground control 3-13, No power at platform control 3-14, Drive train troubleshooting, Won’t drive (platform lowered or elevated) 3-16, Won’t drive (platform elevated only) 3-18, Won’t climb grade 3-20, Drives in opposite direction 3-21
SECTION 3 - TROUBLESHOOTING
3120728
– JLG Lift –
3-11
3.5
TROUBLESHOOTING SECTION - TABLE OF CONTENTS
OHM RATINGS FOR VARIOUS COMPONENTS
PAGE
Ohm Ratings for Various Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
MAIN POWER CIRCUIT TROUBLESHOOTING
Unit Will Not Power Up From Ground Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
No Power At Platform Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Won’t Drive (Platform Lowered Or Elevated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Won’t Drive (Platform Elevated Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Won’t Climb Grade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Drives In Opposite Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Will Only Drive A Short Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Won’t Drive Straight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Noise From Drive Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Platform Will Not Lift Up Using Platform Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26
Platform Will Not Lower Using Platform Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29
Platform Will Not Lift Up From Ground Control Toggle Switch . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
Platform Will Not Lower From Ground Control Toggle Switch . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
Platform Will Not Lower Manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
Platform Lift Up And Down Jerky . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33
Mast Noisy When Lifting And Lowering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34
Platform (Mast) Won’t Stay Elevated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35
Platform (Mast) Descends Too Slowly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36
HYDRAULIC LEAK TROUBLESHOOTING
Miscellaneous Hydraulic Leak Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
BASE FRAME COMPONENTS TROUBLESHOOTING
Caster Wheels Not Operating Freely . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38
Pot Hole Protection (PHP) Bars Will Not Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38