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TESTS AND ADJUSTMENTS<br />
BACKHOES<br />
Main System<br />
Relief Valve<br />
valve section and in port of the boom valve<br />
section. Note also that the restrictor is installed<br />
with the spring side out.<br />
3. Check for plugged or damaged orifice and missing<br />
or damaged spring. Replace as necessary.<br />
RESTRICTOR ID<br />
47 48<br />
Boom<br />
1.575 mm<br />
(0.062 in.)<br />
1.880 mm<br />
(0.074 in.)<br />
Test Port<br />
M94990<br />
4. Move boom function operating lever to its limit in<br />
either direction.<br />
5. Observe gauge as pressure is applied.<br />
Swing<br />
Stabilizer<br />
1.397 mm<br />
(0.055 in.)<br />
1.575 mm<br />
(0.062 in.)<br />
1.880 mm<br />
(0.074 in.)<br />
1.880 mm<br />
(0.074 in.)<br />
Specifications:<br />
47Backhoe.........15510[14480minimum]kPa<br />
...................(2250[2100minimum]psi)<br />
48Backhoe.........17580[16550minimum]kPa<br />
...................(2550[2400minimum]psi)<br />
Results:<br />
6. If tests indicate valve relief pressure must be<br />
adjusted, add or subtract shims. Shims are<br />
available in 1.02 mm (0.04 in.), 0.51 mm (0.02<br />
in.), and 0.254 mm (0.01 in.) sizes.<br />
RESTRICTOR INSPECTION<br />
Restrictor<br />
Boom Valve<br />
Swing Valve<br />
M77724<br />
1. Remove inlet and outlet elbows from valve sections.<br />
2. Note location of restrictors in both ports and swing<br />
3-14 6/22/99
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