Assemble
NOTE:
Coat all backup rings and O-rings with a
light coat of clean hydraulic oil to make installation
easier.
NOTE:
The assembly procedures for the auxiliary I
and II sections are the same. The auxiliary I sec-
tion is used in the procedures described below be-
cause it contains the anti-stall valve.
1.
Install the spool, washer, spring, and plug, with
new O-ring, into the bore of the auxiliary con-
trol valve section. Tighten the plug to 14
±1 N•m (120 ±12 lbf in). See Figure 7.
2.
Install the washer, spring, and plug, with new
O-ring, into the auxiliary control valve section.
See Figure 7. Tighten the plug to 14
±1 N•m (120 ±12 lbf in).
3.
Install two poppets, two springs, and two plugs,
with new O-rings installed, into the auxiliary
control valve section. See Figure 7. Tighten the
plugs to 81 ±8 N•m (60 ±6 lbf ft).
4.
Install the new O-ring, backup ring, two O-
rings, and backup ring on each PPRV. Install
two PPRVs and four capscrews into the auxili-
ary control valve section. See Figure 7. Tighten
the capscrews to 3 ±0.3 N•m (24 ±2 lbf in).
Install
NOTE:
Step 1 and Step 2 are for a three-function
control valve. Step 3 through Step 5 are for four-
function control valves.
1.
Install new O-rings into the side of tilt control
valve section. Install the auxiliary I control
valve section on the four tie rods. See Figure 8.
2.
Install the outlet control valve section. See Out-
let Control Valve Section, Install.
3.
Install new O-rings into the side of tilt control
valve section. Install the auxiliary I control
valve section on the four tie rods. See Figure 8.
4.
Install the auxiliary II control valve section on
the four tie rods. Install new O-rings into the
side of auxiliary II control valve section.
5.
Install the outlet control valve section. See Out-
let Control Valve Section, Install.
6.
Install the four nuts on the tie rods on the out-
let control valve section. Tighten the three
13 mm (½ in.) nuts to 24 ±2 N•m (212
±18 lbf in) and the 15 mm (9/16 in.) nut to 45
±4 N•m (33 ±3 lbf ft). See Figure 6.
Tilt Control Valve Section
Remove
1.
Remove the outlet control valve section. See
Outlet Control Valve Section, Remove.
2.
Remove the auxiliary control valve section(s).
See Auxiliary Control Valve Section, Remove.
3.
Remove the tilt control valve section from the
lift/lower control valve section.
4.
Remove and discard O-rings from the side of
lift/lower control valve section.
Disassemble
NOTE:
Disassemble the tilt control valve section
only as needed to accomplish the repairs required.
1.
Remove four socket head capscrews and two
proportional pressure-reducing valves (PPRV)
from the tilt control valve section. See Figure 8.
Remove and discard the backup ring, two O-
rings, backup ring, and O-ring from each
PPRV.
2.
Remove the plug, spring, washer, and spool
from the tilt control valve section. Discard the
O-ring on the plug. See Figure 8.
3.
Remove the socket head capscrew, spring and
piston from the spool.
4.
Remove the plug, spring, and washer from the
tilt control valve section. Discard the O-ring on
the plug. See Figure 8.
5.
Remove two plugs, two springs, and two pop-
pets from the tilt control valve section. Discard
one O-ring from each plug. See Figure 8.
Main Control Valve Repair
2000 SRM 1899
10
