Great Plains P16229 Serial No 18007975 2009 - Manual (Page 24)

Hydraulic Reset Flatliner
Operating Instructions
24
5. Servicing and Maintenance
5.7.1 Valve Setting
Sequence - Factory Setting
(Read in conjuction with page
80)
1. Raise machine, to ensure tines are fully
clear of the ground at depth.
2. Adjust reliefs (REF. X), (REF. T) and
precharge valve (REF. Z) all clockwise
fully.
3. Adjust flow control (REF. Y) fully
clockwise, then anti-clockwise 2 turns.
4. Raise tines, then pressure fully down.
Set failsafe (REF. T) to between 190-
220 bar. If available pressure is
insufficient to achieve this, set to ½ turn
clockwise above that where valve
relieves at tractor maximum pressure.
If tines do not relieve under severe
overload, this valve should be
reduced (anti-clockwise) until this
occurs in work, otherwise damage
may occur.
5. Pressure tines down, and set
accumulator relief (REF. X) to 90 bar as
tines are lowered.
6. Adjust precharge valve (REF. Z) 1/8 turn
anti clockwise.
7. Pressure tines down and check cylinder
pressure reads 90 bar and the
corresponding rod pressure reads
between 20-40 bar (achieved by
adjusting precharge valve (REF. Z)).
8. Put main circuit in float, check above
pressures are maintained at least at the
lower values indicated.
5.7.2 Valve Adjustment - To
Suit Field Conditions (Read
in conjuction with page 80)
(a) Normal / Stony conditions
To avoid damage to tines and chassis in
severe stone conditions reduce accumulator
relief (REF. X) as tines are held in ‘lower’ to
read 90 bar.
(b) Hard, stone free conditions
It is permissible to increase gauge pressure
for accumulator relief (REF. X) as tines are
held in ‘lower’ to read up to 120 bar with a
cylinder pressure between 40-60 bar rod
pressure for working in hard, stone free
conditions.