Model: 95P10AR
Two Stage Hydraulic Aviation Floating Auto-Retract Axle Jack
S/N 263 and Up
12/2018 | Rev. 01 Page | 9
7.1 SERVICING (continued)
o. Firmly close accumulator shutoff valve. Verify that the test gauge reads 340 ± 10 psig just prior to the valve fully
seating.
p. Open release valve on control console.
q. Remove hose and test gauge assembly tool P/N 872839.
r. Replace cap on test port.
7.2 DISASSEMBLY INSPECTION
CAUTION!
The safety pop-off valve, located in the valve block, should not be removed unless absolutely necessary.
The valve is set and sealed at the factory to by-pass hydraulic fluid back to the reservoir at 4-6% above the
rated capacity of 95 tons. If adjustment is required, see procedure in 7.5 Testing.
When necessary to disassemble the jack, drain all hydraulic fluid from reservoir and carefully inspect the following:
1. Inspect interior walls of jack cylinder and hand pump cylinders for smoothness and freedom from rust, nicks, scratches
and excessive wear.
2. Inspect exterior walls of jack plungers for smoothness and freedom of rust, pits and excessive wear.
3. Check extension screw, cylinder, plungers, etc., for corrosion, wear and condition of threads.
4. Verify that the extension screw has a positive stop to prevent it from being extended beyond its safe thread engagement.
5. Inspect packings, seals, gaskets and wipers in the cylinder assembly and hand pumps for cuts, scratches, deterioration
and distortion.
6. Inspect stop rings for excessive scoring and/or wear.
7. Check hand pump oil screens by removing valve block and verifying cleanliness.
8. Check air pump oil screen located inside reservoir by removing reservoir cover and verifying cleanliness.
9. Inspect valves and valve seats in the valve block for scratches, dents and proper seating of the balls.
10. Inspect all pivot pins for wear, cracks, pits or evidence of damage or pending damage.
11. Inspect all areas for excessive dirt, oil, dust and chips.
7.3 OVERHAUL INSTRUCTIONS
No definite time schedule can be established for the overhaul of the jack for replacement of the various moving parts. The
number of times the jack is raised and lowered and the amount of load raised at each operation materially affect the life of the
working parts. Do not overload the jack. Overloading is dangerous, will hasten the need for overhaul and may damage the
jack. During overhaul, replace all parts that do not pass disassembly inspection requirements. Regardless of apparent
condition, replace all parts marked with (♦) in the parts breakdown. A repair parts kit (P/N 95P10ARPK) which contains all of
the parts marked with (♦) is available and recommended to keep on hand at your facility. A cylinder assembly seal kit (P/N
95P10ARSK) contains only the seals needed to rebuild the cylinder assembly.
1. To disassemble cylinder assembly:
a. Open release valve located on control console.
b. Open accumulator shutoff valve located underneath the frame.
c. Remove outer stop ring using spanner wrench (P/N 880481) and remove outer o-ring.
d. The inner plunger, outer plunger, and extension screw may now be carefully removed as a unit using extension screw
lifting tool (P/N 880482). Do not cut or damage any of the seals.
e. Remove inner stop ring using spanner wrench (P/N 880480) and remove inner o-ring.
f. Remove inner plunger and extension screw from outer plunger carefully. Do not cut or damage any of the seals.
g. Remove inner plunger diaphragm retaining ring and diaphragm from bottom of inner plunger.
h. Remove extension screw roll pins and screw extension screw down through inner plunger.
2. Should it be necessary to remove cylinder from base, proceed as follows:
a. Remove hydraulic hose from top portion of cylinder.
b. Remove hydraulic hose, velocity fuse and nipple from lower portion of cylinder.
c. Remove cap screws, lockwashers and bars from the top of the base (4 places).
d. Remove cap screws, lockwashers and centering springs from the side of the base (4 places).
e. Cylinder may now be removed from the base.
f. Remove cylinder diaphragm from cylinder using spanner wrench (P/N 86305T).
g. Do not loosen or remove the two setscrews and jam nuts at the side of the base.
CAUTION!
When reassembling cylinder assembly (see figure 3), ensure cylinder (P/N 880408), outer plunger
(P/N 885504), inner plunger (P/N 885506), cylinder diaphragm (P/N 880420), inner plunger diaphragm
(P/N 880415) and extension screw (P/N 880418) all have an 'H' stamp on the bottom (for high heat treat).
If no 'H' is stamped on bottom of these parts, do not reassemble, contact Malabar for further instruction.
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