JLG 800S Service Manual - Manual (Page 283)

SECTION 5 - HYDRAULICS
3121139 – JLG Lift – 5-13
Adjustments Made at the Platform Valve
Assembly
NOTE: When replacing the level up or level down cartridge,
the function should be cycled, and then the crack
pressure value calibrated.
PLATFORM LEVEL UP
1. Install a high pressure gauge at port “M1”. Activate
level up to the end of stroke, you should read 2600
psi (179 Bar).
2. The level up relief valve is located to the right and
above port M1. Turn clockwise to increase, counter-
clockwise to decrease.
PLATFORM LEVEL DOWN
1. Install a high pressure gauge at gauge port “M2”,
Activate level down to the end of stroke, you should
read 1800 psi (124 Bar).
2. The level down relief valve is located to the right and
below port M2. Turn clockwise to increase, counter-
clockwise to decrease.
PLATFORM JIB UP AND DOWN
1. Install a high pressure gauge at port M3. Activate jib
up or down, you should read 1700 psi (117 Bar).
2. The up relief valve is located above port M3. Turn
clockwise to increase, counterclockwise to
decrease.
PUMP HI-PRESSURE RELIEF VALVE
Go back to the function pump and re-set the hi-pressure
from 2800 psi (193 Bar) back to 2500 psi (172 Bar).