(g)
Lubricateentiregland and slide it onto plunger with recessed end on outside.

(h)
Lubricatepump body bore and slide plunger and gland into pump body.

(i)
Install scraper onto gland recess by sliding scraper over plunger with tapered lip of scraper facingoutward.

(j)
Attachbracketto pump body with four screws. Torque to 70 inch-pounds.

(k)
Positionlink and Install quick click pin.

(I)
LubricateO-ring and install on seat.

(m)Install spring, ball, and lubricatedseatinto pump body suction port. Secure with snap ring.
73.Cleaning, Inspection, and Repair of Hand Pump.
(a)
Cleanpump parts with suitable solvent and dry thoroughly.

(b)
Inspectplunger for enlarged pinholes and inspect surface area for scratches, burrs, etc, which coulddamageO-ring.

(c)
Inspect check balls and seats for damaged seatingareas and corrosion.

(d)
Check general conditionof all other parts.

(e)
Repairstopumpare limited to polishingoutsmallscratches,burrs,etc. ReplacewornO-rings anddamagedparts.

74. Installationof Hand Pump.
(a)
Positionhandpumpon mounting bracketand secure withbolts.

(b)
Connect hydraulic pressureand suction lines to forward end of pump.

(c)
Bleed hand pump and test hand pump operation.

(d)
Installaccesspanel.

(e)
Ensure reservoir is filled with hydraulic fluid.

75. Bleeding Hand Pump.
Purge hand pumpby operating pumpuntil all air is expelled from pump. Thisusually requires approximately15 pump cycles.
EFFECTIVITY:
040-999
29-10-00Jan10/90
PIPERAIRCRAFT

PA42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. Main (continued)
76. HandPumpTest.
(a)
Ensurereservoirisfilledwithhydraulicfluid.

(b)
Removecap from door-openport. Operateemergencyhandpump until fluidflowsfromportwithnoevidenceof airin system. Replenishreservoirwithcleanhydraulicfluid.

(c)
Removefittingandinstall 2100 psigaugeat door-open port.

(d)
Operateemergencyhandpumpveryslowly until pressureongaugestopsincreasing,indicatinghandpump relief valvehasopened.

CAUTION:  WHENBLEEDINGHANDPUMPRELIEFVALVE,HANDPUMPMUSTBE OPERATEDVERYSLOWLYAS PRESSURE IS INCREASED. IF OPERATED RAPIDLY,DAMAGETO VALVE CANOCCUR,AS AIR WILLSLAM PARTS
AGAINSTEACHOTHER.
(e)
Ensuremaximumgaugecomplieswiththosein29-00-00,Chart2. Duringpumpingoperation, emergencyhandpumpmustnotfeel spongy duringupor down stroke.

(f)
Crackgaugeindoor-openport to releasepressure;removegauge.Reinstallfitting at door-

openport.
NOTE:Aftercompletingtest, reinstall lineandcheckreservoirfluidlevel.
7.GT-Ring  12 NutSafety
8. O-Ring  13.BackUp Wire 1.RodEnd

9.BackUp \ 14.O-Ring
2.Locknut 5. Safety Wire 10 Nut 15.Race

4. EndCap 6. Piston  16. Ball
3. GT-Ring  17. Plunger
GearDoorActuatingCylinder 
Figure 412 
EFFECTIVITY: 
PAGE36Jan 10/90 29-10-00  040-999 

PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

A. Main (continued)
6. Rod End 
-1. Cylinder Body  Safety Wire  6. Back Up —-7.EndCap 
-3. GT-Ring  8. GT-Ring 

Gear Actuating Cylinder (Nose Gear)
Figure 413

EFFECTIVITY:
040-999
PAGE37
29-10-00 Jan 10/90

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

CHAPTER 30

LIST OF EFFECTIVE PAGES

CHAPTER  CHAPTER 
SECTION  PAGE  DATE  SECTION  PAGE  DATE 
30-EFFECTIVITY  1  Feb 1/98  30-60-00  1  Jan 10/90 
30-CONTENTS  1  Jan 10/90  30-60-00  2  Jan 10/90 
30-CONTENTS  2  Jan 10/90  30-60-00  3  Jan 10/90 
30-CONTENTS  3  Jan 10/90  30-60-00  4  Jan 10/90 
30-10-00  1  Jan 10/90  30-60-00  5  Jan 10/90 
30-10-00  2  Jan 10/90  30-60-00  6  Jan 10/90 
30-10-00  3  Jan 10/90  30-60-00  7  Jan 10/90 
30-10-00  4  Jan 10/90  30-60-00  8  Jan 10/90 
30-10-00  5  Jan 10/90  30-60-00  9  Jan 10/90 
30-10-00  6  Jan 10/90  30-60-00  10  Jan 10/90 
30-10-00  7  Jan 10/90  30-60-00  11  Jan 10/90 
30-10-00  8  Jan 10/90  30-60-00  12  Jan 10/90 
　
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