You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
REPAIR<br />
BACKHOES<br />
ofliftarm.Liftarmshouldraiseto450 ± 3 mm<br />
(17.7 ± 0.12 in.) as shown, without engaging the<br />
relief valve.<br />
7. If specification is not met, shorten the lift arm<br />
position feedback rod to increase, or lengthen to<br />
reduce the maximum height until within<br />
specification. The relief valve should not engage.<br />
REPAIR<br />
SYSTEM RELIEF VALVE<br />
INSPECTION<br />
Procedure:<br />
Spring<br />
Shims<br />
Poppet<br />
Relief Valve Housing<br />
M77723<br />
1. Remove inlet/outlet housing from valve assembly.<br />
2. Remove relief valve housing and disassemble<br />
valve.<br />
3. Check for broken spring or damaged poppet.<br />
Replace valve if necessary.<br />
4. Use valve seal kit to replace all seals, washers, and<br />
O-Rings.<br />
5. 47 Backhoe: Install same number and size of<br />
shims that were removed to maintain 14 480 –<br />
15 515 kPa (2100 – 2250 psi) relief pressure.<br />
6. 48 Backhoe: Install same number and size of<br />
shims that were removed to maintain 16 550 –<br />
17 580 kPa (2400 – 2550 psi) relief pressure.<br />
7. 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 />
3-16 6/22/99
Change language