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WARNING
Do not operate without safety unloader.
Safety unloader ships with pump
assembly, but is not pre-installed.
Safety unloader must be installed
before using pump.
Failure to comply may result in death
or serious personal injury.
WARNING
Do not plug outlet of safety unloader.
Plugging safety unloader outlet results
in pressure build up.
Failure to comply may result in death
or serious personal injury.
Safety unloader valve
Refer to Fig. IPB 1, page 12.
If pressure switch fails to operate,
safety unloader valve (1) activates at
3 750 to 4 250 psi (259 to 293 bar) lubricant
pressure to relieve supply line pressure.
Safety unloader valve (1) is not serviceable
and must be replaced if malfunctioning
occurs.
Upon reassembly, tighten to
10 ft.lbf (13.5 Nm). Safety unloader
is preset and non-adjustable.
Vent valve service
1 Refer to Fig. 3 and Fig. IPB 1, page 12.
Loosen hose assembly (15) and
(vent) hose assembly (11).
2 Remove hex head cap screws (40)
and lockwashers (39) and remove
vent valve (26).
3 Position vent valve (26) in vice with vice
jaws gripping flats on vent valve base.
4 Remove elbows (25, 27) and
reducer nipple (16).
5 Remove cylinder (51) with piston and
U-cup assembly (50).
6 Remove packing assembly (49) from
cylinder (51).
7 Inspect needle (52) and valve seat (53) for
foreign matter that may be lodged and
keeping needle (52) from sealing in
valve seat (53).
8 Clean and inspect again for damage.
Replace if valve seat (53) appears
damaged by nicks, grooves or scoring.
9 Remove valve seat (53) from
valve body (54) by placing a
end wrench onto flats. Using an adjustable
wrench, turn open end wrench to
loosen seat.
10 Replace valve seat (53) if damaged.
11 Remove and replace check seat
gasket (55) below valve seat (53).
12 To ease assembly, coat needle (51) and
cylinder (50) inside diameter
with lubricant.
13 Install valve seat (53) into valve body (54)
to a torque of 25 ft.lbf (39 Nm).
14 Install cylinder (50) onto valve body (53)
and tighten to a torque of
100 ft.lbf (135 Nm).
NOTE
Elbow (25) must be facing down.
Orient elbow (27) as shown in
Fig. IPB 1, page 12 to prevent excessive
rubbing of hydraulic hose on pump.
NOTE
Replace packing assembly (49) if grease
leakage is evident from weep hole in
hydraulic cylinder.
9
/
in open
3
4
Vent valve (26)
50
49
3
/ in NPTF
4
Fig. 3
1
/ in NPTF
4
51
52
53
54
55
3
/ in NPTF
4
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