Ingersoll-Rand 7700-E Series Manual

Save These Instructions
Edition 5
November 2021
CCN 04615308
Chain Hoists
Series 7700-E and 7700-ET
yInstallation, Operation and
Maintenance

2
Only allow Ingersoll Rand trained technicians to perform maintenance on this prod ct. For additional information
contact Ingersoll Rand factory or nearest Distrib tor.
Manuals can be downloaded from ingersollrand.com
The se of other than gen ine Ingersoll Rand replacement parts may res lt in safety hazards, decreased
performance and increased maintenance and will invalidate all warranties.
Original instr ctions are in English. Other lang ages are a translation of the original instr ctions.
Refer all comm nications to the nearest Ingersoll Rand Office or Distrib tor.

3
Table of Contents
Model Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
To place in service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hook S spended Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Trolley S spended Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Air and L be Req irements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Inspection and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Load Chain and Anchors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Gears, Bearings and Sprocket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Brake...................................................................................... 12
Throttle Valve Head and Gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hooks and S spension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
AirMotor.................................................................................. 12
General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Removal and Installation of Load Chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Installation................................................................................. 13
Brake Adj stment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Disassembly and Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Removal of Hoist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
HeadSection............................................................................... 15
Brake and Gearing Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
MotorSection.............................................................................. 15
Ho sing Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Typical Cross Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
HeadSection............................................................................... 18
Disassembly............................................................................ 18
Assembly .............................................................................. 18
Brake and Gearing Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Disassembly............................................................................ 20
Assembly .............................................................................. 20
MotorSection.............................................................................. 20
Disassembly............................................................................ 20
Assembly .............................................................................. 20
Ho sing Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Disassembly............................................................................ 22
Assembly .............................................................................. 22
Upper Hook Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Disassembly............................................................................ 23
Assembly .............................................................................. 23
Lower Hook Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
400# & 800# Roller Chain Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1/4 and 1/2 Ton Link Chain Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1 Ton Link Chain Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1600# Roller Chain Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Controls Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4
Pendant Control 3-Hose System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Disassembly............................................................................ 29
Assembly .............................................................................. 29
Assembly of Controls to Hoist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Pendant Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Spark-Resistant Hoist Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
LoadChain................................................................................. 33
Zinc Plated Steel Link Chain 37708-( ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Accessories Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
PipedExha st.............................................................................. 34
Tro bleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Service Kits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
B llard Snap Hooks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Hose-Carrier Trolleys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Brake Spring Spreader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Series 7700 Hoist Chain Basket Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table of Contents

5
Model Identification
Model Code Explanation
Example: 7770E-2C10-C6S 7770E 2
--C C 6S
10
Base Model:
7770E =125 kg 1/8 T (275 lbs)
7718E = 275 kg 1/4 T (550 lbs)
7756E = 500 kg 1/2 T (1100 lbs)
7776E = 1000 kg 1 T (2200 lbs)
7712EL = 275 kg 1/4 T (550 lbs) Spark Resistant
7714EL = 680 kg 0.68 T (1500 lbs) Spark Resistant
Control:
0 = No control provided
1 = Pull Chain
2=Single Motor Pendant
3 = Two Motor Pendant
4 = Three Motor Pendant
Suspension (1):
A = Fixed Lug
K =
R =
Bullard Hook (manual closing)
C=
=
=
=
=
=
Swivel Steel Snap Hook
Bronze Snap Hook
DA =
DD =
Plain Rigid Trolley (universal wheels “A” ange)
Plain Rigid Trolley (universal wheels “D” ange)
FXXA (2) Hand Geared Trolley (universal wheels “A” ange)
FXXD (2) Hand Geared Trolley (universal wheels “D” ange)
HA = Vane Motor Powered Trolley (universal wheels “A” ange)
HD Vane Motor Powered Trolley (universal wheels “D” ange)
Length of Lift:
10 =10 feet (3 metres) Standard
XX Specify Length
Lower Hook:
K = Bullard Hook (manual closing)
Bullard Hook (self closing)
C = Steel Snap Hook
R =
G =
Bronze Snap Hook
Length of Pull Chain or Pendant Control Hose Drop: *
6=
=
6 feet (1.8 metres) Standard
XX Specify Length (in feet)
Options:
P = Piped Away Exhaust
S=Steel Chain Container
U = Fabric Chain Container
Notes:
(1) XX = Specify length of hand chain required. Example: "08" = 8 feet, standard.
(2) Order hose lengths in feet. Metric sizes listed for reference only.
For spark-resistant models, refer “Spark-Resistant Hoist Section,” p. 32.

6
Installation
WWAARRNNIINNGG
!
• THE HOISTING EQUIPMENT SHOWN AND DESCRIBED IN THIS MANUAL SHALL NOT BE USED
TO LIFT OR TRANSPORT HUMAN CARGO.
• The hoist shall be installed only in locations that will permit the operator to stand free of the
load at all times. ARO® hoist is completely lubricated and load tested before being shipped
from the factory.
To place in service
Hook Suspended Models
Select an overhead s pport capable of safely s pporting combined weight of hoist and its capacity load. Hang
hoist, being certain the pper hook is firmly seated in the center of the hook saddle and that the safety latch is
properly closed. The se of a secondary safety cable is recommended on page 37.
Trolley Suspended Models
The trolley side plates m st be spaced so the trolley wheels will properly engage the beam on which the trolley will
be operated. Adj stment for vario s beam sizes is accomplished by arrangement of the spacer washers on the
shaft which connects the trolley side plates. The hoist can be s spended from the trolley by sing trolley adapter or
by attaching the pper hook directly to shaft Fig re 1, p. 7. Use of the trolley adapter is recommended. Trolley parts
can be fo nd in man al MHD56083 for the TIR/RT trolley series.
The distance between the o tside edges of the trolley wheels sho ld be approximately 1/2 inch greater than the
width of the beam flange. The n mber of spacer washers sed to space side plates o t m st be the same on each
side of the shaft (or trolley adapter) and the remaining spacers m st be eq ally distrib ted on the shaft o tside the
trolley side plates at each side between the side plates and lock n ts, Fig re 1, p. 7. When installing the trolley on
the beam, be certain side plates are vertical.
Assemble trolley adapter to hoist ho sing. Determine the n mber of spacer washers needed to properly space side
plates for beam to be sed, and assemble shaft to trolley adapter. Assemble spacer washers, side plate, spacer
washers and n t to one side of shaft. Position trolley and hoist on beam and assemble spacer washers, side plate,
spacer washers and n t to other side of shaft. Tighten n ts sec rely. The lock n ts m st properly engage shaft
extending all the way thro gh the n t.
The trolley wheels sho ld be positioned as close as possible to the edge of the beam flange. Operate the trolley
over the entire length of the beam track and observe operation. If it appears the trolley side plates can be moved
closer together and freedom of movement maintained, remove an eq al n mber of spacer washers from between
the side plates and trolley adapter at each side and assemble these spacers to the o tside of the side plates
between the side plate and lock n ts.
The beam on which the trolley is to be sed m st safely s pport the combined weight of the hoist, trolley, and
capacity load. Minim m t rning radi s of the trolley is 24 inches for 1/4 and 1/2 ton models; 36 inches for 1 ton
models.
Connect hoist to nearest air so rce sing a minim m 1/2 inch i.d. air hose assembly. S fficient air hose m st be
provided to reach the farthest point of travel of the trolley.
ARO® model 7703 hose trolley assemblies are recommended to keep air hose elevated and in line with the hoist,
refer to “Hose-Carrier Trolleys,” p. 37.

7
igure 1. MHP3409
WIDTH OF BEAM FLANGE
PLUS 1/2" (13 mm)
TROLLEY ADAPTER
TROLLEY ADAPTER MOUNTING
WIDTH OF BEAM FLANGE
PLUS 1/2" (13 mm)
EQUAL NO.
NO.
OF SPACERS
EQUAL
OF SPACERS
NO.EQUAL
OF SPACERS
NO.EQUAL
OF SPACERS
SIDE PLATES MUST
BE VERTICAL
SIDE PLATES MUST
BE VERTICAL
HOOK ON TROLLEY MOUNTING
PENDANT CYLINDER ASSY (2) 45801
HOSE TO DOWN LEVER
AIR INLET ADAPTER FOR MAIN
AIR SUPPLY HOSE TO HOIST
U-BRACKET 33989
STRAIN CABLE
AIR SUPPLY HOSE TO
PENDANT CONTROL HANDLE
HOSE TO UP LEVER
IInnssttaallllaattiioonn

8
Air and Lube Requirements
Air Pressure of 90 psig (6 bar) at the air inlet of the hoist is req ired for maxim m motor efficiency. If necessary, an
air reg lator sho ld be installed to maintain this press re when hoist is in operation.
iltered And Oiled Air will allow the hoist to operate more efficiently and yield a longer life to operating parts and
mechanisms. A line filter capable of filtering particles larger than 50 microns sho ld be sed with a line oiler.
ilter-Regulator-Lubricator ( -R-L) assembly model C38341-810 is recommended for se with each hoist. The
capacity of this F-R-L is adeq ate to provide clean (40 micron) oiled and reg lated air for the hoist. The F-R-L m st
be installed on the stationary air line, in that order, with the l bricator nearest to the hoist.
Load Chain Lubrication - Chain sho ld be l bricated periodically with heavy “EP” Gear Oil. Occasional cleaning of
the chain nder normal operation conditions will tend to red ce wear and prolong chain and pocket wheel (or
sprocket) life. To properly clean, remove chain from hoist (refer to “Removal and Installation of Load Chain,” p. 13)
and wash in an oil solvent. L bricate chain. Under highly contaminated operating conditions, the load chain sho ld
be cleaned and re-l bricated with greater freq ency to remove grit, sand, and other contaminants.
Oil Reservoir in head sho ld be filled with spindle oil (29665) after each 40 ho rs of operation.
Inject Grease (33153), 2 to 3 strokes, thro gh grease fitting in hoist ho sing to provide l brication for gearing, and
thro gh fittings of trolley wheels a minim m of every 160 ho rs of operation.
Lower Block Assembly sho ld be l bricated any time the lower block is disassembled either for inspection or for
maintenance, or for chain replacement. Refer to “Assembly,” p. 22 and “1 Ton Link Chain Models,” p. 26 for
l brication instr ctions.
Recommended Hose Size - 1/2 inch (13 mm) nominal inside diameter.
Recommended Lubricants: Spindle Oil 29665, 1 qt. (0.9 liter) container for oiler and air inlet; Grease 33153, 5 lb. (2.3
kg) can for gears, lower block and bearings; O–Ring L bricant 47622327001, 2 oz. (28g) t be for l brication and
installation of O–Rings.
Part Number Where Used Description
29665 Air Motor
A high quality light turbine or spindle oil. Rust inhibited, with viscosity of
100-150 S.U.S. At 100° F. Oil is compatible with polycarbonate type air line
lubricator bowls.
33153 Gears & Bearings
A high quality “EP” Extreme Pressure anti-friction bearing and gear grease,
NLGI NO. 1. Free of corrosive matter and fillers, with a viscosity of
approximately 750 S.U.S. at 100° F.
47622327001 (2 oz tube) O-Rings & Lip Type A stringy lubricant for rubber seals, with good adhesive qualities.

9
Operation
WWAARRNNIINNGG
!
• Do not operate this hoist before reading Product Information Manuals.
• Read all documentation supplied with the product.
• Contact factory if in doubt about installation, operation, inspection and maintenance
instructions.
• Do not discard manuals. Keep manuals readily available for all personnel.
OPERATE HOIST CAUTIOUSLY to become familiar with the performance of the hoist. Hoist shall be operated from a
position that will not be hazardo s to the operator. Abr pt operation, res lting from “jerking” of controls, sho ld be
avoided.
The rate of lift or descent of any ARO®chain hoist can be governed man ally by the operator, both the p ll chain
and pendant controls provide nlimited variation between f ll speed and the slowest “INCHING” movement. This
is accomplished by movement of p ll chain handles or pendant control levers. P lling down on p ll chain control as
far as possible or depressing pendant control levers f lly will res lt in maxim m hoist speed.
On pendant control models, the control handle is s pported by a strain cable to prevent stress on hoses.
BEFORE STARTING TO LIFT, ens re chain is properly seated in the sprockets (or pocket wheel). Do not lift or move
load more than a few inches ntil load is well balanced in sling or lifting device. Care shall be taken in hoisting to
ens re that chain is not kinked or twisted and load does not contact any obstr ction Be certain hoist is centered
over load to prevent danger of load swinging when lifted. Side or end p lling sho ld always be avoided. Take p
slack chain caref lly to avoid overstress ca sed by jerking load when lifting. Be certain that safety latch on load
hook is properly closed. On 1 ton link chain models to avoid jamming of chain in lower block, allow only s fficient
slack in chain to permit attaching hook to load.
DO NOT wrap the hoist chain aro nd the load. The load shall be attached to the hook by means of slings or other
approved devices and shall be properly seated in the saddle of the hook.
The maxim m lift rate of a hoist is constant, provided that air press re and load are also constant. The maxim m
descent rate of a hoist, with the exception of sparkresistant models (see spark-resistant hoist section), can be varied
within fixed limits by means of reg lating valves located on the nderside of the head ho sing.
Hoists are shipped from the factory with reg lator valves preset for rate of descent and fastest rate of lift. If a faster
rate of descent is desired, t rn reg lator valve clockwise by small increments while testing with desired or rated
load attached. If a slower rate of lift is desired, t rn reg lator valve co nterclockwise by small increments while
testing with desired or rated load.
The operator shall test the brakes each time a load approaching the rated load is handled by raising the load j st
eno gh to clear the floor, or s pports, and checking for proper brake action and lift contin ed only if brake is
f nctioning properly.
CCAAUUTTIIOONN
!
• DO NOT OPERATE HOIST WITHOUT CHAIN STOP ATTACHED PROPERLY TO HOIST LOAD
CHAIN. DO NOT USE CHAIN STOP AS A LIMIT SWITCH (to stop hoist when operating in the
“up” mode). The chain stop function is to keep the lower hook components (lower block on 1
ton models) from striking control arm (37719) should an over-run condition ever occur.
• DO NOT EXCEED RATED LOAD CAPACITY OF HOIST.
• DO NOT OPERATE HOIST OVER PEOPLE.

10
igure 2. MHP3410
X
DN
UP
REGULATOR VALVE
igure 3. MHP4608
WRONG RIGHT
APPEARANCE OF TWISTED
CHAIN - ALTERNATING LINKS
DO NOT FORM A STRAIGHT
LINE
USE EXTREME CAUTION TO INSURE LOWER HOOK
ASSEMBLY HAS NOT BEEN FLIPPED THRU CHAIN
RESULTING IN TWISTING OF CHAIN
APPEARANCE OF CHAIN THAT
HAS NOT BEEN TWISTED -
ALTERNATING LINKS FORM A
STRAIGHT LINE
WWAARRNNIINNGG
!
• DO NOT USE HOIST FOR HUMAN TRANSPORT.
• DO NOT LEAVE LOAD SUSPENDED FOR EXTENDED OR UNATTENDED PERIODS.
• INSURE LOAD CHAIN IS HANGING PROPERLY AND IS FREE OF TWISTS, LOOPS OR KINKS.
• MAXIMUM LOWERING SPEED WITH RATED CAPACITY LOAD IS VERY HIGH. ADJUST WITH
CARE. REFER TO MHP3410, p. 10
Safe and efficient operation of yo r ARO®hoist can be attained by observing proper operating, inspection and
maintenance proced res. Allow only competent and q alified people to operate hoist and s bject each hoist to a
reg lar inspection and maintenance proced re. The q alified hoist operator m st be caref lly instr cted in the safe
operation of the hoist, incl ding a st dy of the man fact rer’s literat re, and m st thoro ghly nderstand proper
methods of hitching loads. The operator sho ld have a good attit de regarding safety.
To aid in better nderstanding of proper and safe se of hoists: the p blication “Overhead Hoists”, ASME B30.16 -
2017, can be p rchased from the American Society of Mechanical Engineers, Three Park Aven e, New York, NY
10016.
OOppeerraattiioonn

11
Inspection and Maintenance
ARO recognizes the need for periodic inspection of hoist components as an important step in preventive
maintenance. The type of application for a hoist varies so greatly, it is impractical to recommend an exact time-table
for inspection of the hoist, Where hoist is s bjected to contin o s operation with capacity loads, it is recommended
the nit be inspected daily to weekly. If the application is less demanding, the nit sho ld be inspected weekly to
monthly. In general, the freq ency of inspection sho ld be determined by the severity of the application.
The ser of a hoist sho ld be g ided by any existing federal, state or local reg lations governing the se, testing or
inspection of the hoist.
The following points and areas are recommended for inspection:
Load Chain and Anchors
1. Vis ally check for nicked, go ged, twisted, bent, corroded, r sted, worn or broken links. Check ends of chain
where chain is anchored to hoist frame and where chain is fastened to lower hook. Check anchors and pins.
2. Check chain elongation with a vernier caliper as shown in Fig re 4, p. 11 and Fig re 5, p. 11. IT IS NOT
INFERRED that a chain is safe prior to the occ rrence of elongation of the chain. It is inferred ONLY, that when
said elongation is evident, the chain m st be replaced. Other factors, s ch as those mentioned as a vis al check,
may render chain nsafe long before replacement d e to elongation is necessary.
Note: New chain should never be used on a worn pocketwheel. Replace chain and pocketwheel as a pair, chain
should also be replaced when replacing brake shoes.
igure 4. MHP3411
(16 mm) .625 PITCH
4.755 NEW CHAIN
(120.7 mm)
VERNIER CALIPER
IF VISUAL CHECK REVEALS NO DEFECTS, PROCEED AS FOLLOWS:
LAY USED CHAIN ON FLAT SURFACE AND MEASURE OVER EIGHT (8) ROLLS, WHILE
CHAIN IS PULLED TAUT, AS SHOWN. MEASUREMENT SHOULD BE TAKEN ON PORTION
OF CHAIN WHICH HAS MOST PASSED OVER THE SPROCKET.
IF MEASUREMENT TAKEN IS 4.810 INCHES OR MORE. CHAIN SHOULD BE REPLACED.
igure 5. MHP3427
VERNIER CALIPER
5.250 NEW CHAIN
IF VISUAL CHECK REVEALS NO DEFECTS, PROCEED AS FOLLOWS:
LAY USED CHAIN ON FLAT SURFACE AND MEASURE BETWEEN SEVEN (7) LINKS AS
SHOWN. MEASUREMENT SHOULD BE TAKEN ON PORTION OF CHAIN WHICH HAS
MOST PASSED OVER THE POCKET WHEEL.
IF MEASUREMENT TAKEN IS 5.355 OR MORE. CHAIN SHOULD BE REPLACED.
1/4
(6 mm) (19 mm) .750 PITCH
(133 mm)
(136 mm)
Gears, Bearings and Sprocket
1. Check condition of teeth on gears and motor shaft pinion.
2. Check condition of sprocket teeth or pockets of pocketwheel.
3. Check condition of bearings.
4. Replace any worn or damaged parts.

12
Brake
1. Check brake linings and components.
2. Check brake operation.
Note: When replacement of brake shoes is indicated, they must be replaced as a pair. Also replace chain at this time.
Throttle Valve Head and Gears
1. Check condition of valve body, valves, and O–Rings on valves.
2. Check condition of gear teeth and bearings.
3. Replace any worn or damaged parts.
Hooks and Suspension
1. Check pper and lower hooks and component parts for bent, worn, cracked, broken or otherwise damaged
parts.
2. On trolley s spended models, check conditions of trolley parts, trolley adapter and component parts. Replace
any damaged parts.
igure 6. MHP4606
CORRECT
HOOK OPENING
1-1/8" (29 mm) ON 1/4 & 1/2 TON MODELS
(LOWER HOOKS).
1-1/4" (32 mm) ON UPPER & 1-TON
(LOWER HOOKS)
Air Motor
1. Check end faces of rotor for ro ghness and blade slots for wear or b rrs. A new blade sho ld slide in and o t of
slots witho t binding.
2. Check blades for wear, warpage or other damage.
3. Check cylinder bore diameter for ro gh circ lar grooves from scoring. A badly scored cylinder cannot be
restored by honing since it will only enlarge bore diameter, widening seal point between rotor and cylinder,
hindering free exha st of air and res lt in loss of speed and power.
4. Check end plates for wear or scoring. Check bearings.
5. Replace any excessively worn or damaged parts.
General Maintenance
AIR HOISTS are made of precision parts and sho ld be handled with reasonable care when servicing. Excessive
press re exerted by a holding device may ca se distortion of a part. Apply press re evenly when disassembling (or
assembling) parts which have a press fit. When removing or installing bearings, apply press re to the bearing race
that will be press fit to the mating part; if this is not practiced, damage co ld occ r to the bearing. It is important
that the correct tools and fixt res are sed when servicing this air hoist.
DISASSEMBLY sho ld be done on a clean work bench with a clean cloth spread to prevent the loss of small parts.
After disassembly is completed, all parts sho ld be thoro ghly washed in a clean solvent, blown dry with air and
inspected for wear levels, ab se, and contamination. Do ble sealed or shielded bearings sho ld never be placed in
solvent nless a good method of re-l bricating the bearing is available. Open bearings may be washed b t sho ld
not be allowed to spin while being blown dry. When REPLACEMENT PARTS are necessary, cons lt drawing
containing part.
BEFORE REASSEMBLING, l bricate parts where req ired. Use 33153 grease, or eq ivalent, in bearings. Use
47622327001 l bricant for “O” ring assembly. When assembling “O” rings or parts adjacent “O” rings, care m st
be exercised to prevent damage to the r bber sealing s rfaces. A small amo nt of grease will s ally hold steel
balls and other small parts in place while assembling.
WHEN ORDERING PARTS, be s re to list PART NUMBER, PART NAME and MODEL NUMBER OF HOIST. USE ONLY
GENUINE ARO REPLACEMENT PARTS.
IInnssppeeccttiioonn aanndd MMaaiinntteennaannccee

13
Removal and Installation of Load Chain
LINK CHAIN HOISTS - A new chain sho ld never be sed on a worn pocketwheel. Replace chain and pocket-wheel
as a pair. To remove chain; disconnect end of load chain from anchor l g on ho sing by removing screw (Y157-51)
and washer (Y13-4-C).
Note: Models with a chain basket, remove chain stop from end of chain. Chain can be pulled through housing by
hand while holding brake open, by pulling (or pushing on control arm (either end . On 1 ton models,
disconnect opposite end of load chain from anchor bracket (41624 by removing nut (Y109-524 and bolt
(41625 . Remove chain stop and lower hook assembly.
ROLLER CHAIN MODELS - Disconnect end of load chain from anchor block (44686) by removing connecting link
(33363).
Note: Models with a chain basket, remove chain stop (ring from end of chain. Chain can be pulled through housing
by hand while holding brake open, by pulling (or pushing on control arm (either end . On 1 ton models,
disconnect opposite end of load chain from anchor bracket (37579 by removing bolt (37580 and anchor pin
(34316 . Remove chain stop and lower hook assembly.
igure 7. Installing Load Chain (MHP3428)
Installation
LINK CHAIN MODELS - Position hoist in a vise or other s itable holding device (Fig re 7, p. 13) and remove ho sing
cap, brake spring and brake shoes, T rn brake wheel by hand to rotate pocketwheel while caref lly feeding chain
thro gh chain g ide and aro nd pocketwheel. P ll s fficient chain thro gh ho sing to allow end link of chain to be
attached to anchor l g on ho sing.
IMPORTANT NOTICE: The link chain must be positioned around the pocketwheel so the weld on the standing links
of chain face outward from pocketwheel ( igure 7, p. 13). ALSO, the end link of chain must be fed over
pocketwheel so it will be positioned properly to permit attaching chain to anchor lug on housing without twisting
of chain ( igure 19, p. 26).
WWAARRNNIINNGG
!
DO NOT attempt to feed chain over pocketwheel or sprocket by air power as chain will be pulled
through at a very fast rate.
ROLLER CHAIN MODELS - Remove ho sing cap, brake spring and brake shoes. T rn brake wheel by hand to rotate
sprocket while caref lly feeding chain thro gh g ide and aro nd sprocket. P ll s fficient chain thro gh ho sing to
allow end link of chain to be attached to anchor block and anchor l g on ho sing.
To assemble chain to lower block on 1-TON models, refer to “Assembly,” p. 22 and “1 Ton Link Chain Models,” p.
26.

14
igure 8. MHP3429
POCKET WHEEL
CHAIN GUIDE
CHAIN WELD
Brake Adjustment
To adj st brake, insert screwdriver thro gh hole in ho sing cap. T rn screw (37701) co nterclockwise to tighten
brake, clockwise to loosen brake.
Brake adj stment sho ld be made with air t rned on and with rated load attached to lower hook. Operate hoist to
raise load applying slight press re to pendant control. If load starts to lower before it is raised by motor, tighten
brake ntil no slippage is evident. Care sho ld be taken not to tighten brake more than necessary to hold load. If
brake is too tight, it will ca se erratic hoist control.
igure 9. MHP3430
RReemmoovvaall aanndd IInnssttaallllaattiioonn ooff LLooaadd CChhaaiinn

15
Disassembly and Assembly
To minimize the possibility of ports damage and for convenience, the steps for disassembly or reassembly listed on
the following pages are recommended.
Removal of Hoist
1. Lower and disconnect load from hoist.
2. Sh t off air at so rce and operate hoist control to bleed air from hoist and line.
3. Disconnect air hose at inlet swivel (on pendant control models, remove pendant control hoses) and remove
hoist from overhead s spension.
4. If chain basket is being sed, remove from hoist.
5. Drain oil from reservoir in head.
6. Remove trolley from hoist ho sing.
7. Place hoist pside-down in vise and clamp on pper mo nting on ho sing.
8. If hoist is to be completely disassembled, it is recommended the load chain be removed. For removal of chain,
refer to “Removal and Installation of Load Chain,” p. 13.
Head Section
1. Remove roll pin (Y178-56) from gear (34022) and control rod (34021).
Note: If head assembly is not to be disassembled, control rod may be removed with head, thereby making it
unnecessary to re-time gear (34022 with throttle valves (see Figure 10, p. 16 . To remove control rod with
head, remove roll pin (Y178-55 from control arm (37719 , remove roll pin (Y178-60 from brake block
(34029 and remove brake block.
2. Remove screws (Y154-54) and washers (Y14-10).
3. Remove head assembly from ho sing.
Brake and Gearing Section
1. Remove screws (Y19-113-C) and ho sing cap assembly.
2. Slide brake spring (42982) part way off brake shoes (33387 or 33387-1) and remove spring with brake spring
spreader (33541). This will release brake shoes and steel balls (Y16-10).
3. Place a pin thro gh hole in brake wheel (33376) to keep from t rning and remove n t (Y12-106) and washer
(Y117-616). Remove brake wheel.
4. Remove roll pin (Y178-60) from brake block (34029) and remove brake block from control rod (34021).
5. Remove screws (Y99-41) and washers (30997) and remove gearing assembly.
Motor Section
1. After removal of head assembly, ho sing cap, n t (Y12-106) and washer (Y117-616); motor assembly may be
removed from ho sing.
Housing Section
1. Follow disassembly proced res as o tlined in head section, brake and gearing section and motor section.
For f rther disassembly of sections, see pages 18 to 29.

16
igure 10. Timing of Head (MHP3431)
STEP 2
STEP 3
POSITION POWER UNIT SO YOU ARE FACING END WITH AIR INLET.
WITH VALVE PARTS AND GEAR (34030) REMOVED, PLACE VALVE BODY IN VALVE
OPENING. INSERT FINGER IN EACH END OF VALVE OPENING AND ALIGN ENDS OF
VALVE BODY WITH ENDS OF BUSHING. NOTE:VALVE BODY MUST BE INSTALLED WITH
IDENTIFICATION MARK AS SHOWN.
POSITION CONTROL ARM PARALLEL WITH OPENING.
DROP GEAR (34030) INTO PLACE AND SECURE WITH SHAFT (34025) AND LOCK
SCREW.
ENDS OF VALVE BODY FLUSH WITH BUSHING
GEAR 34022
IDENTIFICATION MARK ‘‘X” ON END OF VALVE BODY
CONTROL ARM PARALLEL WITH OPENING
GEAR 34030
ASSEMBLE BALANCE OF VALVE PARTS.
STEP 1
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17
Typical Cross Section
igure 11. MHP3432
400 LB. & 1/4 TON 800 & 1600 LB.
1/2 & 1 TON
800 LB. & 1/2 TON
LINK CHAIN ROLLER CHAIN
400 & 800 LB.
1/4 & 1/2 TON
LOWER BLOCK
LINK CHAIN
LOWER BLOCK
ROLLER CHAIN
1600 LB. & 1 TON
- E - ET
DDiissaasssseemmbbllyy aanndd AAsssseemmbbllyy

18
Head Section
igure 12. 46073–1 Head Assembly (MHP3433)
ADAPTER 46211
RETAINING RING Y145-28
SWIVEL 46839
"O" RING (2) Y325-115
SWIVEL BODY 33314
INCLUDES PIPE
PLUG (3) Y227-3
(NOT SHOWN)
46071 HEAD
FILLER 34028 (3)
WASHER (2) 31389
SCREEN 33672
OIL SCREW (2) 30747
OLITE CASTING 33190
SET SCREW (2) 41598
* CONTROL ROD 34021
* "O" RING Y325-9
VALVE CAP (2) 34026
"O" RING (2) 04662045
"O" RING (2) Y325-116
SPRING (2) 38966
LIFT VALVE 46079
VALVE BODY (2) 41595
"O" RING (2) Y325-11
ROLL PIN Y178-56
GEAR 34022
SHAFT 34025
"O" RING Y325-19
LOCK SCREW 34024
GEAR 34030
VALVE BODY 37704
VALVE 37703
CAP SCREW (6) Y154-54 *
LOCK WASHER (6) Y14-10 *
SCREEN 46072
"O" RING Y325-17
SCREEN 31648
*NOT INCLUDED IN HEAD ASS'Y
NOT USED WITH PENDANT
CONTROL MODELS
INCLUDED IN SWIVEL KIT 46840
Disassembly
1. Remove head from ho sing as o tlined in “Removal of Hoist,” p. 15.
2. Remove lock screw (34024), gear (34030) and shaft (34025).
3. Remove valve caps (34026), “O” rings (Y325-116) and springs (38966).
4. Valves (33703) and (46079) with “O” rings (04662045) and valve body (37704) may now be removed from either
end of head ho sing.
5. Swivel assembly may be disassembled while mo nted to head or removed from head. To disassemble, remove
retaining ring (Y145-28), p ll off swivel (46839) exposing “O” rings (Y325-115) and swivel body (33314).
6. To remove oilite casting (33190), remove oil screw (30747) and washer (31389) on side of head. Insert
screwdriver into opening and remove oilite costing.
7. M ffler fillers (34028) and screen (33672) are exposed after removal of head from ho sing and may be removed.
8. To remove reg lator valve (41595), remove set screws (41598) and p ll valves from ho sing.
Assembly
1. Assemble screen (33672) and fillers (34028) to head. Ass ming other hoist components are assembled to
ho sing, assemble head to ho sing with gasket (41623). Sec re with washers (Y14-10) and screws (Y154-54).
2. Assemble “O” rings (Y325-17) and (Y325-115) and screen (46072) to swivel body and assemble to head.
Assemble swivel to swivel body and sec re with retaining ring (Y145-28). Assemble screen (31648) and adapter
(46211) to swivel.
3. Assemble oilite casting (33190), screw (30747) with washer (31389) and reg lator valves (41595) with “O” rings
(Y325-11) to head.
Note: Assemble valves to head with slot in valve positioned to accept set screw. Secure valves with set screws
(41598 . After complete assembly of hoist, loosen set screw and adjust valve for desired rate of lift and
descent. Refer to “Air and Lube Requirements,” p. 8.
4. With gear (34022) and control rod assembled to ho sing, assemble valve parts, see Fig re 10, p. 16.
DDiissaasssseemmbbllyy aanndd AAsssseemmbbllyy

19
Brake and Gearing Section
igure 13. MHP3434
SCREW (2) Y19-113-C
CAPACITY LABEL
45672-1 (1/4 TON)
45672-2 (1/2 TON)
45672-3 (1 TON)
45672-4 (1/8 TON)
46097-2 (1500 lbs.)
46097-3 (400 lbs.)
46097-4 (800 lbs.)
46097-5 (1000 lbs.)
46097-6 (1600 lbs.)
HOUSING CA P 45667
BRAKE SPRING 42982
NUT Y12-106
WASHER- Y117-616 BRAKE SHOE (2)
33387- ROLLER CHAIN MODELS
33387-1- LINK CHAIN MODELS
BRAKE WHEE L 33376
* SCREW 37701
SPACER (2) 38906
BEARING 36546
IDLER GEAR 38905
BEARING 32325
RETAINING RING (2) 38908
NUT (2) 38910
* BALL(2) Y16-10
LIP OF SEAL THIS SIDE
INCLUDED WITH 389 11
END PLATE
SEAL 37706
* SCREW (2) 38907
* SCREW (4) Y99-41
* WASHER (4) 30997
END PLATE 38911
INCLUDES BRACKE T 38904-1 AND
ROLL PIN Y178-43, NO T SHOWN. GEARING ASSEMB LY 41618 (1/4 TON)
GEAR & BEARING ASS'Y. (2) 38912
* NOT INCLUDED WITH GEARING ASS'Y.
ROLL PIN Y178-21
WASHER Y117-616 GEAR & BEARING ASS'Y. 37763
WEAR PLATE (2) 45909
BEARING 36546
BUSHING (2) 37709
SCREW (2) Y194-44
BOLT (2) 33369
SUPPORT RING 45911
NUT Y11-6
BRACKET 37702-1
SCREW 37701
BALL (2) Y16-10
* SEAL 37706
WASHER (4) 30997 END PLATE 45913
SCREW (4) Y99-41
WASHER (2) Y1-516
NUT (2) 33368
LIP OF SEAL THIS SIDE
* INCLUDED WITH 45913 END PL ATE
NOT INCLUDED WITH GEARING ASS'Y.
GEARING ASSEMB LY 45912 (1/2 8.1 TON
DDiissaasssseemmbbllyy aanndd AAsssseemmbbllyy

20
Disassembly
1. Remove ho sing cap, brake spring, brake wheel and components as o tlined on Fig re 11, p. 17.
2. On 1/4 ton models, remove n ts (38910), releasing gear and bearing assemblies.
3. On 1/2 and 1 ton models, remove screws (Y194-44), n ts (33368), washers (Y1-516) and bolts (33369), releasing
s pport ring and gear assemblies.
4. Bearing (36546) and grease seal (37706) sho ld be removed only for replacement.
Assembly
Note: Lubricate gears and bearings liberally with ARO 33153 grease when assembling.
1. Assemble grease seal (37706) and bearing (36546) to end plate, if removed.
2. On 1/4 ton models, assemble bearings (32325) and retaining rings (38908) to idler gears (38905) and sec re to
end plate with screws (38907) and n ts (38910).
3. On 1/2 and 1 ton models, assemble wear plates (45909), gear assemblies and b shings to end plate and sec re
with s pport ring, screws (Y194-44), bolts (33369), washers (Y1-516) and n ts (33368).
4. Assemble end plate to ho sing and sec re with washers (30997) and screws (Y99-41).
5. Assemble brake wheel (33376) to splined end of motor spindle and sec re with washer (Y117–416) and n t (Y12-
106).
6. Assemble steel balls (Y16-10) and screw (37701) into bracket. Position brake shoes (33387 or 33387-1) over brake
wheel and assemble brake spring (42982) over shoes, sing brake spring spreader (33541).
7. Assemble ho sing cap over brake and sec re with screws (Y19-113-C). Refer to “Brake Adj stment,” p. 14.
Motor Section
igure 14. MHP3435
INCLUDES Y178-73 ROLL PIN
1/8 ton Cylinder 49171
NOT INCLUDED IN MOTOR ASSEMBLY
33277 KEY
33373 SPINDLE
33235 BEARING (PAIRED)
Y325-154‘‘O” RING
33284 END PLATE
33272 SPACER (2)
34541 CYLINDER
CYLINDER 34032 (STANDARD DESCENT)
(EXTRA - FAST DESCENT)
43067BLADE (8)
Y325-12 "O" RING (2)
47653686001 WASHER
43068 ROTOR
47663336001 END PLATE
Y200-59 SCREW
TORQUE TO 90-110 IN. LBS.
MOTOR ASS'Y.
46076-STANDARD
46077-EXTRA-FAST
*
*
*
Disassembly
1. Remove motor from ho sing as o tlined on “Removal of Hoist,” p. 15.
2. Remove screw (Y200-59) and washer (47653686001). Motor will now come apart.
Assembly
1. Assemble bearings (33235) and spacers (33272) into end plates.
Note: Bearings (33235 are paired flush face bearings, shielded on one side. The open or unshielded side must
be installed facing the end plate. Lubricate bearings with 33153 grease when assembling.
2. Assemble end plate (33284) together with bearing and spacer on large end of spindle shaft (33373) and slide p
to boss on shaft.
3. Assemble key (33277) into groove in spindle and assemble rotor with groove aligned with key on spindle.
4. Assemble cylinder over rotor to end plate and assemble blades (43067) to rotor.
5. Assemble end plate (47663336001) together with spacer and bearing. Sec re with washer (47653686001) and
screw (Y200- 59). Hold spindle in a s itable holding device, being caref l not to damage splines or threads on
end of spindle.
6. Assemble “O” rings (Y325-12) into end plate.
7. Assemble motor with “O” ring (Y325-154) into ho sing.
DDiissaasssseemmbbllyy aanndd AAsssseemmbbllyy