jcb ROBOT 150, Руководство по обслуживанию

Страница: 205 / 254

16 - 9
Loader Valve
Dismantling
The illustration opposite shows a typical valve with a
manually operated spool. Valves may have two or three
spool sections depending on equipment fitted. For
dismantling of servo spool section see page E/16-10 and for
solenoid spool section see page E/16-11.
On machines from serial number 678316, a different end cap
incorporating a spool lockout solenoid is fitted to the manual
spools as shown at
X . The spool is prevented from moving
unless the solenoid is energised. All other components are
as shown on the main view.
Always work on a clean, dirt free surface.
1 Remove the cap screws and washers 1 and 2 . Remove
seal retainer 3 and end cap 4 .
On machines after serial number 678316, remove
solenoid
27 , remove capscrews 28 and lift off end cap
29 .
2 Remove shoulder screw 5 (or 30 ) from the spool (use a
bar through the eye end of the spool to stop it rotating).
Remove spring seats
6 , spacer 7 , spring 8 and seal
retainer 9 .
3 Remove spool 10 . Remove and discard ‘O’ rings 11 and
wiper seals 12 .
4 Loosen tie rod nuts 13 at the inlet cover end of the valve
assembly. Position the valve assembly upright on its
outlet cover.
5 Remove tie rod nuts 13 and washers 14 . Remove the
inlet cover 15 . Identify each section to note the order of
assembly.
6
Carefully separate all the sections from the tie rods.
Discard all inter-section seals
16 and shims 17 .
Note: Work on the spool sections individually. Do not
interchange parts from individual sections.
7 Remove check valve guide 18 , spring 19 and poppet 20 .
Note that the check valves are secured in position by
one of the tie rods.
8 Remove the auxiliary relief valves 21 and 23 (if fitted)
from each spool section. Remove and discard 'O' rings
22 and 24 .
9 Remove the main relief valve 25 from the inlet section.
Remove and discard 'O' ring 26 .
10 Clean all parts in kerosene, inspect and check for
damage.
Damaged sections should be replaced complete.
Assembly
Assembly is a reversal of the dismantling procedure.
Renew all seals and 'O' rings.
Lubricate all parts with hydraulic oil before assembly.
On machines after serial number 678316, apply 2 or 3 drops
of JCB Threadlocker & Sealer to threads of shoulder bolt
30
after degreasing threads.
Ensure that the spools are inserted in their correct bores.
Before finally tightening tie rod nuts
13
, position the valve
assembly on its mounting feet and ensure the valve is sitting
flat.
On machines after serial number 678316, check operation of
lock-out solenoid
27 after assembly. With the solenoid de-
energised the spool should be locked in the neutral position.
Connect a 12 volt electrical supply to the solenoid and check
for free spool operation. Carry out check three times to
confirm correct operation.
Torque Settings
Item Nm lbf ft kgf m
1 & 2 5 - 8 4 - 6 0.5 - 0.8
5 5 - 8 4 - 6 0.5 - 0.8
13 26 - 28 19 - 21 2.6 - 2.8
21 20 - 24 15 - 18 2.0 - 2.5
23 20 - 24 15 - 18 2.0 - 2.5
25 20 - 24 15 - 18 2.0 - 2.5
27 20 - 24 15 - 18 2.0 - 2.5
28 9 - 12 7 - 9 1.0 - 1.2
30 5 - 8 4 - 6 0.5 - 0.8
Section E
Hydraulics
9803/8500
Section E
16 - 9
Issue 2*
Valves
*
*
*
*
*
*
*
*