Leach 2R-III, Maintenance Manual

Page: 148 / 168

138 Service & Repair
7.
Using an o-ring pick, remove and discard the o-rings and back-up rings from the spool and/or
valve body. Clean and inspect the valve spool, the bore and seal seats in the valve body, as weel as
the seal and dust boot retaining plates for cracks, abnormal wear, rust, or uneven surfaces. Clean
and inspect the dust boot for damage, cracking or swelling.
The dust boots are not included with the seal kits; replace if necessary with Labrie part #
HYV02887 dust boot.
N
OTE
:
Labrie Plus part # HYJ04104 seal kit contains an o-ring marked with a red or orange dot; this is
not used, and should be discarded.
8.
Lubricate a spool backup ring and seal with petroleum jelly and install them onto the valve spool,
backup ring first, using care not to cut them on the spool lands. Slide the backup ring and seal
against the seal retainer plate on the actuator. Lubricate the spool with clean hydraulic oil and
slide it into the valve body gently, seating the o-ring into the valve body seal recess.
9.
Using petroleum jelly, lubricate and install the o-ring then back-up ring onto the spool eye end of
the valve spool. Using the seal retaining plate, press the spool seal and backup ring into the valve
body recess.
10.
Ensure the actuator is properly attached to the valve spool, and position the actuator with the
breather hole in the actuator sleeve pointing toward the bottom of the valve, and pneumatic ports
correctly positioned (air actuated models). Tighten the actuator retaining hardware to 32-36 in.-
lbs (3.6-4.1 Nm).
11.
Install the spool eye end seal retaining plate and dust boot, and tighten the retaining hardware to
32-36 in.-lbs (3.6-4.1 Nm).
12.
Repeat steps 6 through 11 with the remaining valve work sections.
Valve installation, Testing and Adjustment
Clean the valve mounting plate and install it to the valve assembly; tighten the hardware securing the
valve to the mounting plate to 85 ft-lbs (118 Nm). Using a suitable lifting device, reinstall the valve
assembly to the body. Tighten the hardware securing the valve or valve mounting plate to the body to
85 ft-lbs (118 Nm). Install the hoses that were previously labeled to their respective fittings. Install
and tighten the hydraulic tank fill cap.
Operate all functions until the hydraulic fluid is at operating temperature, and check for leaks. Attach
a 0-4,000 PSI hydraulic gauge on the test port of the inlet cover. Start the truck and engage the pump.
Check and adjust pressures (see
Checking Pressures on page 61). Add hydraulic fluid as required to the
hydraulic tank.