Gradall 544D (9136-4003) Service Manual - Manual (Page 69)

RELIEF VALVES
Work Port
The adjacent chart identifies relief valve options avail-
able. Refer to Figures 4-27 thru 4-32 for service infor-
mation. Specify model number and setting (PSI) at crack
or full flow.
“Crack” pressure is setting when relief is passing
1 GPM (3.8 litres/min.).
“Full Flow” is pressure setting when relief is passing
specified GPM (litres/min.).
Check one for each section
3-Way, Casting No. 21105, see Figure 4-2.
4-Way, Casting No. 20645, see Figure 4-3.
4-Way Float, Casting No. 20729, see Figure 4-4.
4-Way Regenerative, Casting No. 21105, see Figure 4-5.
4-Way Tandem, Casting No. 20685, see Figure 4-3.
Free Flow Spool
3-Position Detent (D)
SAE 12 (1 1/16" - 12 UN) Standard
SAE 16 (1 15/16" -12 UN)
Ports with NPT pipe threads are limited to 2000 PSI [136 bar] max.
Specify for “A” and “B” work ports
Anti-Cavitation Check, A-C
“No Relief” Plug
Work Port Relief, Model RD30A Specify
Work Port Relief, Model RD30 Relief
Work Port Relief, Model RP30A Setting
Work Port Relief, Model RP30N
Specify
Relief
Setting
Spool Seal Retainer Assembly, LCHA
Vertical Handle, CVHA
Inverted Vertical Handle
Horizontal Handle, CHHA
Spool Boot Assembly
Less Handle Only, includes link assembly, LHO
Handle Bracket Only, less link assembly, HBO
*Each spool is fitted to its work section housing at the factory and neither part can be purchased separately. O-ring grooves are
machined on the left side (when viewed from the “A” work port end) of each work section housing.
HANDLE-END
OPTIONS**
WORK PORT
OPTIONS
WORK PORT
SIZES
“A” and “B”
WORK PORTS
OPTIONAL
FEATURES
FUNCTION OF
SECTION*
1.
2.
3-5