11
EPS4 series Ebbert Power Source (HK1036
)
p
ower
b
ooSter
S
erVIce
See Figures 2 & 3
.
The power booster is easy to troubleshoot. Attach the Hydraulic Pressure Gauge Assembly (P/N
300456
) to the
hydraulic nipple where the hydraulic line attaches to the power unit. Press and hold the rivet tool trigger, and monitor
the gauge reading. At 80 PSI
*
(
5.51 BAR
) air pressure, hydraulic pressure should stabilize at 3,920 PSI (
270.28
BAR
). If it doesn’t, it indicates possible seal wear and rebuilding is required. The arrow “P” (Figure 3, Detail C) points
to an escape port in the power unit cylinder base. If hydraulic fluid is leaking out of this port, one of the hydraulic
seals is leaking fluid. Escaping air indicates a defective air seal.
*
When using the single-port unit, EPS4, increase the air pressure to 90 PSI (6.20 BAR), which will yield
approximately 4,410 PSI (304.07 BAR) hydraulic pressure.
Removing the Power Booster
: Disconnect the blue air hose and the green air hose. Loosen, but do not remove,
hydraulic fluid line (Figure 2); this will prevent fluid spilling. Remove the two nuts and washers (Figure 3, Items 19,
20, & 21) that attach the power booster assembly to the power unit enclosure, then place a rag under the hydraulic
fitting and finish removing hydraulic line.
Disassembly
: (Figure 3) Remove the five hex head bolts, and separate the end castings from the fiberglass air
cylinder. Inspect the air piston and hydraulic piston for surface irregularities; also inspect the walls of the air cylinder.
Remove the piston guide and seal housing by using the Seal Housing Remover (P/N
300455
), and tapping out with
a hammer until they can be pushed from the cylinder base.
Replacing Seals
: When replacing seals, be sure they are positioned as shown in Figure 3, Detail C. Wipe all seals
with a lightweight seal lubricant.
ADDITIONAL NOTES
•
When reassembling the air cylinder and end castings, torque all bolts to the specifications noted in Figure 3.
• After replacing the power booster on the power unit, attach the air supply to the power unit. This will ensure that
the air piston is in the full back position for bleeding air from the system; see
A
ir
B
leeding
the
P
ower
U
nit
for air
bleeding instructions.
WARNING: Disconnect all power from the
Power Unit prior to disassembly.
