Gradall 534C-10 (2460-4129) Service Manual - Manual (Page 54)

Reason for Hydraulic Filter Condition Check
Dirty suction filters can restrict oil flow to the charge pump. This can lower control pressure which can affect the
machine’s ability to move, especially when ambient temperature is under 32°F.
Change the hydraulic filters if they have more than 1,000 hours on them. To check hydraulic filter condition, warm
the hydraulic system oil to operating temperature (minimum 100°F). Check the filter restriction indicator on the
return filter. The indicator should not show filter bypass with the engine at full throttle and the park brake engaged.
If it shows bypass, replace the suction and return filters. Use hydraulic filter (P/N 9114-3144) for both suction and
return filters.
See Figure 3.
Only GRADALL-supplied filters meet or exceed the filtration requirements of the drive system. If any other type of
filter was installed, change it to o GRADALL filter and sample oil for condition. Failure to use GRADALL filters
may void warranty.
FIGURE 3
HYDRAULIC RESERVOIR ASSEMBLY
II. Hydraulic Filter Condition
Form No. 29633 3/97 2