TTS Marine Deck Crane, Davit, Hatch Cover & Winch Service

BLUF: MarineListing delivers 24/7 Class-certified engineering support, hydraulic overhauls, in-situ slewing bearing machining, and genuine spare parts supply for TTS Marine (now part of MacGregor) electro-hydraulic deck cranes, 30-ton MOB/lifeboat davits, piggyback hatch covers, and mooring winches worldwide. Specializing in high-capacity cargo cranes (50-ton SWL, heavy lift, and provision cranes), our factory-certified hydraulic fitters and Class-approved load-testing specialists execute 5-year Continuous Machinery Surveys (CMS) and ILO 152 proof load tests. Operating across major trade and drydock corridors—including Singapore, Rotterdam, Dubai, Houston, and Busan—we execute complete hydraulic pump/motor overhauls, slewing ring rocking clearance gauging, luffing cylinder re-sealing, and water bag proof load tests strictly to IACS Class rules.

1. Statutory Mandates, Classification Rules & Class Survey Rigor

Shipboard cargo cranes, mooring winches, hatch cover hydraulics, and life-saving davits operate under strict statutory regimes enforced by the International Labour Organization (ILO Convention No. 152), SOLAS Chapter III, and IACS Classification Society rules. Mechanical or hydraulic failure during cargo operations causes severe shore worker fatalities, massive structural hull damage, terminal downtime, and immediate Port State Control (Paris MoU, USCG) vessel detentions.

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|                                  STATUTORY DECK MACHINERY REGULATORY BLUEPRINT                     |
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|  ILO Convention No. 152        --> Safety and Health in Dock Work (Lifting Appliances & Gear)      |
|  SOLAS Chapter III, Reg 20     --> Operational Readiness, Maintenance and 5-Year Davit Testing     |
|  IMO Res. MSC.402(96)           --> Requirements for Maintenance & Overhaul of Launching Appliances|
|  IACS Unified Requirement M56  --> Survey of Lifting Appliances & Cargo Handling Equipment         |
|  ISO 4309                      --> Cranes - Wire Ropes - Care, Maintenance, Inspection & Discard   |
|  ISO 7365                      --> Shipbuilding and Marine Structures - Deck Machinery - Towing    |
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Statutory Inspection & Proof Load Intervals

• Annual Thorough Examination of Lifting Appliances (ILO 152 & Class):
  • Complete visual, functional, and non-destructive testing (NDT) of crane booms, jib pivot pins, luffing/hoisting wire ropes, and hook blocks.
  • Slew ring bearing bolt torque verification and rocking clearance (tilt deflection) measurement ($< 2.5\text{ mm}$ limit).
  • Hydraulic system pressure relief valve calibration and emergency lower function test.
• 5-Year Quadrennial Proof Load Survey (ILO 152 & IACS UR M56):
  • Static and dynamic proof load testing using calibrated load cells and certified water weights:
    • $\text{SWL} \le 20\text{ tons}$: Proof load = $1.25 \times \text{SWL}$.
    • $20\text{ tons} < \text{SWL} \le 50\text{ tons}$: Proof load = $\text{SWL} + 5\text{ tons}$ (e.g., $55\text{ tons}$ for $50\text{T}$ crane).
    • $\text{SWL} > 50\text{ tons}$: Proof load = $1.10 \times \text{SWL}$.
  • Dynamic hoisting, luffing, and $360^\circ$ slewing speed and braking distance verification under full proof load.
• SOLAS 5-Year Lifeboat & MOB Davit Overhaul (IMO MSC.402(96)):
  • Dynamic proof load test of launching davit and winch brake to $1.10\times\text{ max working load}$.
  • Overhaul of centrifugal speed governors and manual friction release brake linings.

Classification Society Compliance Matrix

2. Engineering Architecture & Diagnostic Systems

TTS electro-hydraulic deck cranes utilize closed-loop or open-loop high-pressure hydraulic circuits driven by an axial piston pump pack mounted inside the crane housing.

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|                         TTS ELECTRO-HYDRAULIC DECK CRANE ARCHITECTURE                              |
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|                                                                                                    |
|   [ Main Electric Motor (3-Phase 440V / 160 kW) ] ──► [ Triple Hydraulic Pump Skid (Rexroth/Parker)]|
|                                                               │                                    |
|              ┌────────────────────────────────────────────────┼──────────────────────────────┐     |
|              ▼                                                ▼                              ▼     |
|   [ Hoisting Winch Circuit ]                       [ Luffing Cylinder Circuit ]     [ Slewing Drive]|
|     ├── High-Speed Axial Piston Motor                ├── Double-Acting Cylinder      ├── Radial Motor|
|     ├── Multi-Disc Spring Brake (Failsafe)           ├── Over-Center Counterbalance  ├── Planetary GB|
|     └── Spooling Drum & Wire Rope (32mm)             └── Anti-Burst Safety Valves    └── Pinion/Ring |
|              │                                                │                              │     |
|              ▼                                                ▼                              ▼     |
|   [ 50-Ton Cargo Hook Block ]                      [ Box Girder Crane Jib ]        [ Slew Bearing ]|
|                                                                                                    |
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Slew Bearing Rocking Clearance (Tilt) Mathematics

The wear on internal slewing ring raceways and rolling elements (balls/rollers) is determined by measuring vertical axial play ($\Delta z$) using dial test indicators mounted between the crane revolving superstructure and fixed pedestal at $0^\circ, 90^\circ, 180^\circ, 270^\circ$:

$$\text{Tilt Deflection} = |\Delta z_{\text{max boom radius}} - \Delta z_{\text{min boom radius}}| \le \delta_{\text{permissible}}$$

$$\delta_{\text{permissible}} = \delta_{\text{baseline}} + 1.5\text{ mm} \quad (\text{TTS / Rothe Erde specification})$$

When tilt deflection exceeds $2.5\text{ mm}$, the slewing ring must be condemned and replaced to prevent catastrophic crane detachment.

Hydraulic Hoisting Winch Torque & Braking Equations

The dynamic line pull ($F_{\text{rope}}$) and motor torque ($M_{\text{motor}}$) required to lift a 50-ton cargo load with a 4-fall reeving system is:

$$F_{\text{rope}} = \frac{\text{SWL} \cdot g}{n_{\text{falls}} \cdot \eta_{\text{sheave}}}$$

$$M_{\text{motor}} = \frac{F_{\text{rope}} \cdot D_{\text{drum}}}{2 \cdot i_{\text{gearbox}} \cdot \eta_{\text{gear}}}$$

The multi-disc fail-safe friction brake holding torque ($M_{\text{brake}}$) must satisfy:

$$M_{\text{brake}} \ge 1.50 \cdot M_{\text{motor rated}}$$

3. Step-by-Step Standard Operating Procedure (SOP)

Our certified marine hydraulic technicians follow an ISO 9001:2015 and ILO 152 accredited 5-stage servicing workflow.

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|                         5-STAGE TTS DECK MACHINERY SERVICING WORKFLOW                              |
+----------------------------------------------------------------------------------------------------+
|  STAGE 1: Pre-Overhaul Diagnostic Baseline, Hydraulic Pressure Dump & Slew Bearing Rocking Log     |
|  STAGE 2: Hydraulic Pump/Motor Overhaul, Multi-Disc Brake Refurbishment & Valve Block Servicing    |
|  STAGE 3: Luffing Cylinder Dismantling, Hard-Chrome Rod Inspection & Polyurethane Seal Renewal    |
|  STAGE 4: Boom Structure Ultrasonic NDT, Jib Pivot Pin Clearance Check & Wire Rope Re-Spooling     |
|  STAGE 5: Water Bag Proof Load Testing (125% SWL), Dynamic Brake Proofing & Class Register Entry  |
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Stage 1: Diagnostic Baseline & Slew Bearing Measurement

1. Hydraulic Baseline: Connect multi-channel digital pressure test kit to main pump ports ($P_{\max} = 280\text{ bar}$, pilot pressure $35\text{ bar}$). Log oil temperature and pump case drain leakage ($< 15\text{ L/min}$).
2. Rocking Clearance: Position crane boom at minimum radius ($4\text{ meters}$). Mount dial test indicators ($0.01\text{ mm}$ precision) on pedestal ring; lower boom to maximum radius ($28\text{ meters}$). Record rocking clearance across 4 quadrants.
3. Safety Isolation: Lower hook to deck, engage mechanical slew locks, de-energize $440\text{ VAC}$ main motor, and vent hydraulic accumulators.

Stage 2: Hydraulic Winch & Motor Overhaul

1. Winch Motor Teardown: Dismount axial piston hoisting motor (Rexroth A2FE / Parker). Inspect swashplate and piston shoes for cavitation scoring. Replace rotary shaft seals and distributor faceplates.
2. Multi-Disc Brake Overhaul: Open wet multi-disc brake housing. Inspect sintered bronze friction plates for thermal glazing; measure spring free length; renew piston square-ring seals.
3. Control Valve Blocks: Ultrasonic clean proportional directional control valves, over-center load-holding valves, and secondary relief valves.

Stage 3: Luffing Cylinder Overhaul

1. Cylinder Extraction: Rig heavy-duty chain blocks; support crane jib on certified pedestal rest. Extract luffing cylinder rod.
2. Rod Inspection: Measure hard chrome plating thickness ($> 40\ \mu\text{m}$) and check for micro-corrosion or bending runout on lathe ($< 0.1\text{ mm/m}$).
3. Seal Pack Renewal: Install genuine TTS polyurethane chevron packing seals, PTFE step-seals, and double-lip metal-cased dust wipers.

Stage 4: Structure NDT & Wire Rope Renewal

1. NDT Weld Audit: Conduct Magnetic Particle Inspection (MPI per ISO 9934) and Ultrasonic Testing (UT) on boom pivot ears, heel pin bosses, and pedestal deck flange weld seams.
2. Pin Clearance: Measure radial play on boom heel pins and cylinder eye bushings ($< 1.0\text{ mm}$ maximum allowable clearance).
3. Wire Rope Spooling: De-spool hoisting wire rope; inspect per ISO 4309. Install new $32\text{ mm}$ rotation-resistant galvanized steel wire rope using tensioned spooling winch.

Stage 5: Proof Load Testing & Class Sign-Off

1. Static Proof Load: Rig certified water bags filled to $125%\text{ SWL}$ ($62.5\text{ tons}$ for $50\text{T}$ crane). Hoist load $200\text{ mm}$ off deck; hold for 10 minutes. Measure hydraulic cylinder creep ($0\text{ mm}$).
2. Dynamic Load Test: Execute hoisting, lowering, boom luffing, and $360^\circ$ slewing operations under full proof load; verify smooth braking and zero overheating.
3. Cargo Gear Register: Issue official ILO Convention No. 152 Certificate of Test and Thorough Examination (Form No. 2); obtain attending Class Surveyor signature (DNV, ABS, LR, ClassNK).

4. Diagnostic Trouble Codes (DTC) & Failure Mode Matrix

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|                         TTS DECK MACHINERY DIAGNOSTIC FAULT MATRIX                                 |
+----------------------------------------------------------------------------------------------------+
|  Code: AL-HYD-01 | Main Hydraulic System Pressure Low (< 210 bar Under Maximum Hoisting Load)      |
|  Code: AL-HYD-08 | Hydraulic Oil Temperature High Alarm (> 70 deg C) / Oil Cooler Fouled           |
|  Code: AL-BRK-14 | Hoist Brake Slip Warning / Counterbalance Valve Internal Bypass Leakage         |
|  Code: AL-SLW-22 | Slew Bearing Rocking Clearance Exceeded (> 2.5 mm Permissible Threshold)        |
|  Code: AL-LMT-30 | Jib Maximum Radius Limit Switch Open / Anti-Two-Block Limit Interlock Open      |
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5. Global Port Coverage & Emergency Attendance Hubs

MarineListing maintains global heavy deck machinery riding squads equipped with certified water weight bags (up to 100 tons), calibrated digital load cells, and genuine TTS / MacGregor replacement parts worldwide.

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|                      GLOBAL TTS DECK MACHINERY DISPATCH MATRIX                                     |
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|  PORT HUB             | BERTH / DRYDOCK ATTENDANCE | WORKSHOP & LAB CAPABILITY| MOBILIZATION TIMELINE  |
|  Singapore (SGP)      | Jurong, Tuas, Keppel       | Water Bag & Proof Testing| Immediate (2-4 Hours)  |
|  Rotterdam / ARA      | Europoort, Botlek, Damen   | Hydraulic Motor Test Rig | Immediate (2-4 Hours)  |
|  Dubai / Fujairah     | Drydocks World Dubai, DMC  | Slew Ring Machining Base | Immediate (3-6 Hours)  |
|  Houston / GOM (USA)  | Houston Ship Channel, GOM  | USCG / OSHA Approved Team| Immediate (4-6 Hours)  |
|  Busan / Ulsan (KOR)  | Busan Port, HD Hyundai     | Full Spares Warehouse    | Immediate (2-4 Hours)  |
|  Antwerp / Zeebrugge  | Port of Antwerp            | Fast Flying Squad        | Immediate (2-4 Hours)  |
|  Shanghai / Zhoushan  | Zhoushan, Cosco Shipyards  | Heavy Lift Crane Center  | Immediate (4-6 Hours)  |
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6. Comprehensive Technical FAQ

Q1: What is the mandatory proof load test weight for a 50-ton SWL TTS deck crane?

A: Under ILO Convention No. 152 and IACS Unified Requirement M56, the proof load for a lifting appliance with a Safe Working Load ($\text{SWL}$) between $20\text{ tons}$ and $50\text{ tons}$ is calculated as $\text{Proof Load} = \text{SWL} + 5\text{ tons}$. Therefore, a $50\text{T}$ deck crane must be proof tested with a certified load of exactly $55\text{ metric tons}$ (representing $110%\text{ SWL}$).

Q2: How is slewing bearing rocking clearance measured under Class rules?

A: Rocking clearance (axial play) is measured by positioning a calibrated dial test indicator between the stationary pedestal and revolving crane crane housing. The boom is raised to minimum radius ($4\text{ meters}$) to record baseline zero, then lowered to maximum working radius ($28\text{ meters}$) to induce maximum overturning moment. The measured vertical deflection must not exceed the manufacturer's baseline plus $1.5\text{ mm}$ (absolute maximum limit $2.5\text{ mm}$).

Q3: What is required for a 5-year overhaul of TTS / MacGregor MOB davit winches?

A: Under SOLAS Chapter III Regulation 20 and IMO Resolution MSC.402(96), davit winches must undergo complete dismantling every 5 years. This entails: (1) Disassembly of multi-disc friction brakes and centrifugal speed governors; (2) Replacement of brake friction linings, sprag clutches, and oil seals; (3) Renewal of galvanized wire ropes; and (4) 110% dynamic proof load testing witnessed and certified by an authorized service provider and Class Surveyor.

Q4: How do our technicians test TTS piggyback hatch cover hydraulic systems?

A: We test hatch cover hydraulic power units, directional control valves, and high-pressure hydraulic cylinders. We inspect auto-cleating mechanisms, replace damaged hydraulic hoses, and verify hatch cover wheel bearings. Following mechanical overhaul, we conduct Class-approved ultrasonic tightness testing (Sherlog / Cygnus) to verify zero seal leakage.

Q5: What genuine TTS / MacGregor spare parts are maintained in stock?

A: We stock: (1) Rexroth and Parker hydraulic axial piston pumps and winch motors; (2) Multi-disc brake friction plates, springs, and seal kits; (3) Luffing and hoisting cylinder polyurethane seal packs and hard-chrome rods; (4) Certified Rotation-Resistant wire ropes ($24\text{mm}\text{--}36\text{mm}$) and spelter sockets; (5) Slew ring replacement bearings and pinion gears; and (6) Over-center counterbalance valves.

7. Service Engagement, Quotation & Mobilization Protocol

To schedule a 5-year Class proof load test, crane hydraulic overhaul, or request genuine spares:

1. Provide Equipment Specifics: Email vessel name, IMO number, current port/shipyard, crane model (e.g., TTS GL 5028, HL 30T Davit), SWL capacity, and work scope to support@marinelisting.com.
2. Proof Test Scoping & Rigging Allocation: Our Deck Machinery Superintendent prepares certified water weights, digital load cells, and pre-packs Class-certified hydraulic seal kits.
3. Onboard Attendance & Class Certification: Our certified marine hydraulic engineers board your vessel, complete overhauls, execute witnessed proof load tests, and issue official ILO Form No. 2 certificates.