JLG 20VP (3120849) Service Manual - Manual (Page 94)

SECTION 3 - TROUBLESHOOTING
3-38 – JLG Lift – 3120849
3.11 BASE FRAME COMPONENTS TROUBLESHOOTING
Caster Wheels Not Operating Freely
Check For These Obvious Conditions First:
• Is machine operating on a smooth, level surface?
Pot Hole Protection (PHP) Bars Will Not Set
Check For These Obvious Conditions First:
• Obstruction under pot hole bar on either side of machine.
• Obstruction around the actuator assembly at the base of the mast.
Table 3-32. Caster Wheels Not Operating Freely.
STEP ACTION SPEC YES NO
1. Is the caster rotating freely?
— Go to Step 2
Lubricate or
Replace Caster
Housing
2. Is the wheel spinning freely?
— Go toStep 3
Lubricate or
Replace Wheel
3. Is debris stuck in the plastic wheel?
—
Remove Debris or
Replace Wheel
—
Table 3-33. Pot Hole Protection (PHP) Bars Will Not Set.
STEP ACTION SPEC YES NO
1. Check the actuator cables for adjustment or damage. — Adjust or Replace Go to Step 2
2. Check the PHP limit switch(s) at both sides of the machine for dam-
age, adjustment and for continuity through switch to ground when
bars are down.
—
Replace, Adjust
or Repair Wiring
—