Advance Lifts Dock Lifts 10451055 Manual

							 
 
SECTION 7.  POWER UNIT ASSEMBLIES 
 
This section contains drawings and photos of completed power units to aid service 
personnel in identifying each component.  Please be careful to match the correct 
voltage and horsepower as well as model number, when you are trying to identify the 
power unit for your lift.  Advance Lifts uses several different brand name motors and 
pumps, so the ones shown in the pictures may not be the same exact brands as on your 
unit.  More information about individual components may be available in the hydraulic or 
electrical sections of this manual.  Also note that these illustrations may show options 
that were not included on your particular unit and the components used may be 
changed at any time without notice. 
 
Model 1045/1055 Power Units 
 
 
 
 
 
 
 
See Page 8-6 for Hydraulic Diagram and Pages 9-3, 4 for Electrical Diagram 
 
P 7-2 
 
 
Single Phase Motor Pump-Motor Adapter Hydraulic Pump 
Pressure Hose to Valve 
Manifold 
Down Solenoid Junction Box 
Screw-in Suction Filter 
Suction Line to Pump 
Pressure Lines 
to Cylinders 
Reservoir Air 
Breather 
Motor 
Discharge Line to Cylinders 
Fluid Reservoir 
Down Solenoid 
Suction Line 
Model 1055 
(115V, 1Ø only)  
						

							 
SECTION 8.  HYDRAULIC DETAILS 
  
1. General Hydraulic Information:  
A.  All hydraulic cylinders will require the replacement of packing’s and seals after a 
period of time, depending on usage and environmental conditions.  It is normal 
maintenance just like changing oil in an automotive engine.  However, 
maintenance personnel should recognize the difference between leakage and 
weepage: 
B.  Weepage is the normal accumulation of fluid that passes the seals in the course 
of operations, as the hydraulic fluid properly performs its lubrication function on 
cylinder walls and piston rods.  It may be occasionally observed squirting from 
cylinder breathers, but should stop squirting after several cycles of full stroke 
when the small accumulation is cleared. 
C.  Leakage is the fluid that leaks past worn or cut packing’s and seals.  It too may 
be observed squirting but does not stop after several cycles and the lift will 
probably not hold position under load. 
D.  See repacking under cylinder repair procedures. 
E.  Always be careful when working around cylinders, not to nick the extended rod or 
dent the cylinder casing, as this may cause damage to cylinder seals or 
packing’s. 
F.  If you elect to repaint or retouch part of the lift, cover exposed rods with plastic or 
soluble grease that can be removed after painting to insure that no paint sticks to 
the rods and damages packing’s or seals. 
 
2. General precautions: 
A.  Be sure that all pressure is relieved from the hydraulic system before 
disassembling any components.  Continue to hold the down button for several 
seconds after fully lowering the unit on its maintenance device or the ground, 
before opening a line or component. 
B.  Always be careful to avoid contamination entering the system.  Be especially 
careful with the ends of hoses that may fall into oil dry or dirt.  If you suspect 
contamination, flush the system and components. 
 
3. Hydraulic fitting sealant and torque: 
A.  Advance lifts may be equipped with either NPT fittings (tapered) or SAE fittings 
(with “O” ring seals, depending on age, know the difference! 
B.  Be careful when tightening NPT fittings not to over tighten and crack them.  
Swivel fittings are especially vulnerable and should only be snug enough to stop 
leaking. 
C.  If leakage persists after tightening the fittings fairly hard, inspect fittings for burrs 
on the mating edges or the possibility of a 37 degree SAE fitting being mixed with 
the standard 30 degree NPT fittings, or either one being mixed with SAE 45 
degree fittings. 
D.  When using Teflon tape on NPT fittings, be sure the tape is started 1-1/2 threads 
back from the leading edge and only use 2 wraps to be sure that tape does not 
break off and contaminate the system.  You may substitute pipe sealant with 
Teflon paste from Pro Lock or Locktite, but again don’t over apply.  Never use 
sealant or tapes on swivel
 fittings or SAE o-ring fittings. 
E.  Never reuse old Teflon tape.  Once a connection has been opened, remove all 
old tape and apply fresh tape. 
 
P 8-1 
						

							 
 
Oil Recommendations & Seal Compatibility 
 
Fluids: 
 
The current standard hydraulic fluid an ISO 46, (group II base) hydraulic fluid. This is 
the fluid normally supplied by the factory and is suitable for a temperature range of –10 
to +100 degrees Fahrenheit. When replacing or adding fluid to an Advance Lift, use only 
ISO 46 hydraulic fluid that is manufactured with a group II base oil. ISO 46 hydraulic 
fluid can be identified by its purple color. 
 
Seals: 
 
Generally, the seals in the unit are Buna-N-Nitrile and polyurethane.  The hoses are 
composed of either PVC for suction lines or braided wire.  Always call the factory about 
special fluids rather than make assumptions on your own. 
 
Options: 
 
1.  For extremely cold applications we recommend an oil immersion heater which 
simply fits in the drain coupling on most units, replacing the drain plug, these are 
available in appropriate sizes from the factory. NOTE: A separate 120V, 20 Amp 
circuit is required for all oil immersion heaters. 
 
2.  For extremely warm temperature ranges over +100 degrees Fahrenheit consult the 
factory. 
 
Standard Oil Capacities of Listed Equipment  
  
Model 1045/1055 
 2.66 Gallons 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
P 8-2 
 
 
    
						

							 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
P 8-4 
MOTOR 
HYDRAULIC DIAGRAM FOR UNITS WITH INTERNALLY VALVED PUMPS  
 
 
 
RESERVOIR 
PRESSURE RELIEF 
VALVE. FACTORY 
SET, DO NOT 
ADJUST 
SUCTION LINE 
FILTER IN 
RESERVOIR 
CHECK 
VALVE 
INTERNAL 
FILTER 
PRESSURE 
COMPENSATED 
FLOW CONTROL 
VALVE  DOWN 
SOLENOID 
½’’ SAE 100R2 
HYDRAULIC HOSE WITH 
½” FEMALE JIC FITTINGS 
(SUPPLIED BY OTHERS) 
½” MALE JIC FITTINGS 
SUPPLIED BY ADVANCE 
AT PUMP AND FILTER 
PIPE ON LIFT 
FLOW CONTROLS 
CYLINDERS 
1045 HYDRAULIC DIAG
R
AM 
PUMP / VALVE 
ASSEMBLY 
(OPTIONAL) 
MANUAL 
DOWN VALVE 
1/8” BREATHER LINE 
TO RESERVOIR (1/4” ON 
T-SERIES LIFTS)  
						

							 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
P 8-5 
 
 
MOTOR PRESSURE RELIEF VALVE 
(PRESET BY FACTORY, 
DO NOT ADJUST) MANIFOLD 
ASSEMBLY 
RESERVOIR  SUCTION FILTER 
IN RESERVOIR PUMP 
DOWN 
SOLENOID CHECK 
VALVE 
FLOW 
CONTROL 
MANUAL DOWN 
VALVE 
(OPTIONAL) CYLINDERS 
HYDRAULIC DIAGRAM FOR MODEL 1055 (115V 1Ø ONLY) 
FLOW CONTROLS 
HYDRAULIC DIAGRAM FOR UNITS WITH ONE-PIECE MANIFOLDS  
1/8” RETURN LINE 
TO RESERVOIR  
						

							 
 
 
Model 1055 (115V 1Ø ONLY)  
Standard Valve Manifold (Typical) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Reference Page 8-10 for Valve Cartridge Details 
 
NOTE:  Valve numbers coincide with numbers shown in the hydraulic diagram on 
Page 8-4.
 
 
 
 
Part Number Reference 
 
Description                  Part Number 
 
1. Check Valve            001-262 
2. Pressure Relief Valve       001-263 
3. Down Flow Control Valve        001-293 
               4. Down Solenoid Valve         001-279 
 
 
 
 
P 8-6 
 
2. Pressure Relief Valve 
(Do Not Adjust) 
Pressure Line Inlet 
from Pump 1. Check Valve 
Pressure Line to 
C
ylindersPressure Line 
Filter (1035 only) 
3. Down Flow 
Control Valve4. Down Solenoid 
Mounting Hole  
						

							 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
P 8-7  
						

							 
 
Repair Procedures for 1045 & 1055 Cylinders 
 
 
 Tools & Supplies Required: 
 
(2) Small screwdrivers to remove retaining rings and rod wipers. 
(1) snap ring tool (Waldes Truarc external type #S-660 or Industrial pliers  
   #P-104.) 
A (5) gallon bucket to collect fluid from the cylinders. 
Wrenches to disconnect hydraulic fittings. 
Cylinder hone (Craftsman glaze breaker #9K4633 or equivalent). 
Emery cloth 
Clean lint free cloths and hose caps. 
Clean work surface (butcher paper on top of most surfaces works well), with a 
means of holding cylinder end fixed position for disassembly and assembly.  
“Lubriplate Grease” and hydraulic fluid matching the existing fluid in the system 
for topping off when finished. 
Maintenance device supplied with each Advance unit. 
 
Cylinder Removal: 
 
1.  Remove back panel from power unit assembly.  
2.  Fully lower the unit, once lowered; depress the down button an additional 20 
seconds to relieve any pressure from the cylinders.  Remove the power connection 
to the power unit and mark with a warning label or lock the connection out to prevent 
unintended reconnection. 
3.  Disconnect the hydraulic hoses from the cylinders and cap the hose ends to prevent 
contamination.  
4.  Remove the cylinder from the lift by freeing the upper and lower pins. 
5.  Note that if you are going to repack one cylinder on a lift, it is usually a good idea to 
do all cylinders at the same time.  Packing’s generally wear at the same rate and if 
you only repack one cylinder, you may have to pull the lift out of service soon 
thereafter to do the others. 
 
Cylinder Disassembly: 
 
1.  Secure the cylinder with a rod through the clevis or cross tube, do not use a vise, 
which will crush or otherwise damage the housing. 
2.  Using snap ring pliers, remove the retaining rings in front of the cylinder bearings. 
3.  Carefully remove any debris from the retaining grooves, and then pull out the entire 
rod, bearing & piston assembly.  Note that the groove in the cylinder housing has a 
sharp edge on the front side and a beveled back edge.  The sharp edge is 
necessary for proper snap ring retention and will probably cut the packing when it is 
pulled out, but the beveled back edge will allow the new packing to slide in uncut.
 
4.  Remove the hex nut adjacent to the piston, then slide the piston and bearing off of 
the rod.  If the hex nut is assembled with Locktite, a small amount of heat may help 
break the nut loose.  Be sure that all components are placed on clean surfaces to 
avoid contamination. 
 
 
 
 
P 8-8 
  
						

							 
 
 
 
Repacking and Inspection: 
 
1.  Carefully inspect the entire housing with a flashlight, looking for any evidence of rust, 
scratches, or surface blemishes.  Small blemishes may be removed with fine emery 
cloth and larger faults will require the use of the hone listed above.  Be sure to 
thoroughly clean the housing when you are done to avoid contamination. 
2.  Do not become the victim of a false economy by using only part of a repacking kit.  
Since you have invested in disassembling the cylinder, use all new packing parts 
and seals.  
3.  Remove the rod wiper on the bearing by using a screwdriver to bend the seal inward 
to collapse and remove it. Inspect the groove and remove any debris. 
4.  Lubricate and insert a new wiper with your fingers, sliding it into its groove.  
Depending upon temperature, the rod wiper may slide in much easier if it is warmed 
in hot water, then dried, lubricated, and inserted.  The bearing may now be slid back 
onto the rod. 
5.  Begin repacking the piston by using a screwdriver to carefully remove the old 
backup rings and seal from the groove.  Newer cylinders are also equipped with a 
wear ring that should be removed at this time.  Be careful to leave the grooves nick 
free and clean. 
6.  Lubricate the new backup rings, seal and wear ring and gently stretch them into 
place.  Note that the seal fits between the rings. 
7.  Inspect the static seal groove on the cylinder rod, then lubricate the groove and slide 
a new static seal in place.  Slide the piston back into position noting that the flat side, 
not the chamfered side, should rest against the retaining ring or nut.  Reinstall the 
retaining ring or nut using Locktite if the fastener is a plain nut. 
 
Assembly: 
 
1. Liberally lubricate the outside of the new packing kit and the groove in the cylinder 
housing, align the piston carefully and slide the entire assembly back into the 
housing. 
2.  With 3-1/2” & 4” cylinders you may simply compress the retaining ring and slide the 
bearing into position and release the ring into its groove.  With 3” cylinders you must 
slide the bearing beyond its normal position to install the inner retaining ring, insert 
the spacer washer, then install the outer ring.  In all cases be sure that the retaining 
rings are fully seated in their grooves or the cylinders will come apart when fully 
extended, causing an accident. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
P 8-9 
 
 
  
						

							 
 
 
Reinstallation:  
1.  Remount the cylinders in the lift.  
2.  On units made after 4/1/00 reinstall the “Hexagonal” flow controls in the cylinder-
housing nipple, care must be taken to insure the flow controls are installed with the 
flat side visible and the grooved side down as illustrated below. 
3.  Reattach the hoses with special care to avoid contamination. 
4.  Clean up any spilled oil to insure that it is not later misinterpreted as a new oil leak. 
5.  Connect the electrical power and cycle the lift several times, holding the down button 
an extra 20 seconds each time to help bleed air from the hydraulic system.  This will 
eliminate any “Spongy” operation.  Check the oil level and top off ½” from the top of 
the reservoir with the same type fluid originally used. 
6.  The lift is now ready to go back into service. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
P 8-10